The dimensions of the lawn are 24 meters by 16 meters or 32 meters by 12 meters.
Let's start by considering the formula for the perimeter of a rectangle. The perimeter of a rectangle is the sum of the length of all its sides, which can also be written as 2 times the length plus 2 times the width. In this case, we know the total fence length, which is 88 meters. Therefore, we can write the equation as:
2L + 2W = 88 ------(1)
Next, we are given the area of the rectangle, which is 384 square meters. The formula for the area of a rectangle is length multiplied by width. Therefore, we can write:
L x W = 384 ------(2)
We now have two equations with two unknowns. We can solve this system of equations by substitution or elimination method. Let's use the substitution method to solve this problem.
From equation (1), we can express L in terms of W as:
L = (88 - 2W)/2
Substituting this value of L into equation (2), we get:
(88 - 2W)/2 x W = 384
Simplifying the equation, we get:
44W - W² = 384 x 2
Rearranging and simplifying further, we get:
W² - 44W + 768 = 0
We can now solve this quadratic equation to find the value of W. Factoring the equation, we get:
(W - 24) (W - 32) = 0
Therefore, W can be either 24 meters or 32 meters. We can find the corresponding value of L using equation (1).
When W = 24, L = (88 - 2 x 24)/2 = 20 meters
When W = 32, L = (88 - 2 x 32)/2 = 12 meters
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use the information to find and compare δy and dy. (round your answers to four decimal places.) y = x4 6 x = −3 δx = dx = 0.01
δy = 0.1192 and dy = -1.08.
To find δy and dy, we can use the formula:
δy = f(x+δx) - f(x)
dy = f'(x) * dx
where f(x) = x^4 and x = -3.
First, let's find δy:
δy = f(-3+0.01) - f(-3)
δy = (-3.01)^4 - (-3)^4
δy = 0.1192
Next, let's find dy:
dy = f'(-3) * 0.01
dy = 4(-3)^3 * 0.01
dy = -1.08
Comparing δy and dy, we can see that they have different signs and magnitudes. δy is positive and has a magnitude of 0.1192, while dy is negative and has a magnitude of 1.08.
This makes sense because δy represents the change in y due to a small change in x, while dy represents the instantaneous rate of change of y with respect to x at a specific point.
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On Your Own
1) A sphere has a radius of 7 cm. What is the volume?
round your answer to the
nearest cubic centimeter.
Like example 1
4
2) A sphere has a volume of 72π in³. What is the radius?
round to the nearest tenth
of an inch.
Like example 3
Answer:
1) 616[tex]cm^{3}[/tex]
2) 4.2in
Step-by-step explanation:
1)
the volume of a sphere is [tex]4\pi r^{2}[/tex]
so you plug in the radius for r, and that is 4*[tex]\pi[/tex]*[tex]7^{2}[/tex] = 196[tex]\pi[/tex]= approximately 615.75216
round this to the nearest cubic centimeter and its 616
2)
the volume of a sphere is [tex]4\pi r^{2}[/tex]
so [tex]4\pi r^{2}[/tex]=V and V=72[tex]\pi[/tex]
72[tex]\pi[/tex]/4[tex]\pi[/tex]=[tex]4\pi r^{2}[/tex]/4[tex]\pi[/tex]
[tex]\sqrt{18} =\sqrt{r^{2} }[/tex]
4.24264=r
round this to the nearest tenth of an inch and r = 4.2
How many four-letter sequences are possible that use the letters b, r, j, w once each? sequences
There are 24 possible four-letter sequences using the letters b, r, j, and w once each.
To find out how many four-letter sequences are possible using the letters b, r, j, and w once each, we can use the formula for permutations of n objects taken r at a time, which is:
P(n,r) = n! / (n-r)!
In this case, n = 4 (since there are 4 letters to choose from) and r = 4 (since we want to choose all 4 letters). So we can plug in these values and simplify:
P(4,4) = 4! / (4-4)!
P(4,4) = 4! / 0!
P(4,4) = 4 x 3 x 2 x 1 / 1
P(4,4) = 24
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please help, it is on a timer
This is the correct answer
prove or disprove: for any mxn matrix a, aat and at a are symmetric.
For any m x n matrix A, AAT and ATA are symmetric matrices as (AAT)^T = AAT and (ATA)^T = ATA.
To prove or disprove that for any m x n matrix A, AAT and ATA are symmetric, we can use the definition of a symmetric matrix and the properties of matrix transposes.
A matrix B is symmetric if B = B^T, where B^T is the transpose of B. So, we need to show that (AAT)^T = AAT and (ATA)^T = ATA.
Step 1: Find the transpose of AAT:
(AAT)^T = (AT)^T * A^T (by the reverse order property of transposes)
(AAT)^T = A * A^T (since (A^T)^T = A)
(AAT)^T = AAT
Step 2: Find the transpose of ATA:
(ATA)^T = A^T * (AT)^T (by the reverse order property of transposes)
(ATA)^T = A^T * A (since (A^T)^T = A)
(ATA)^T = ATA
Since (AAT)^T = AAT and (ATA)^T = ATA, we have proved that for any m x n matrix A, AAT and ATA are symmetric matrices.
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HELP
2. TRIANGLE ABC~TRIANGLE ADE; find x
B
A
20
15
E
2x + 3
C
Answer:
x = 9
Step-by-step explanation:
since the triangles are similar then the ratios of corresponding sides are in proportion, that is
[tex]\frac{BC}{DE}[/tex] = [tex]\frac{AB}{AD}[/tex] ( substitute values )
[tex]\frac{2x+3}{15}[/tex] = [tex]\frac{20+8}{20}[/tex] = [tex]\frac{28}{20}[/tex] ( cross- multiply )
20(2x + 3) = 15 × 28 = 420 ( divide both sides by 20 )
2x + 3 = 21 ( subtract 3 from both sides )
2x = 18 ( divide both sides by 2 )
x = 9
Answer:
x = 9
Step-by-step explanation:
In similar triangles, the corresponding sides are in same proportion.
AB = AD + DB
= 20 + 8
=28
ΔABC ~ ΔADE,
[tex]\sf \dfrac{BC}{DE}=\dfrac{AB}{AD}\\\\\\\dfrac{2x + 3}{15}=\dfrac{28}{20}\\\\\ 2x + 3=\dfrac{28}{20}*15[/tex]
[tex]2x + 3 = 7[/tex] *3
2x + 3 = 21
Subtract 3 from both sides,
2x = 21 - 3
2x = 18
Divide both sides by 2,
x = 18 ÷ 2
x = 9
Which expression is equivalent to 7-3(2x + 5)?
x
1x
x
A
7-6x+5
B 4(2x + 5)
C 6x-8
D 7-3(7x)
The expression 7 - 3(2x + 5) is equivalent to -6x - 8.
Which of the given expressions is equivalent to 7-3(2x + 5)?Given the expression in the question:
7 - 3(2x + 5)
We can simplify this expression using the distributive property of multiplication over addition or subtraction.
According to this property, when a number is multiplied by a sum or difference, we can distribute the multiplication over each term within the parentheses.
So, applying the distributive property, we get:
7 - 3(2x + 5)
7 - 3 × 2x -3 × 5
= 7 - 6x - 15
Simplifying further, we can combine like terms:
= -6x - 8
Therefore, the expression to -6x - 8, which is option C.
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Assume that you are interested in the drinking habits of students in college. Based on data collected it was found that the relative frequency of a student drinking once a month is given by P(D)-0.60. a. What is the probability that a student does not drink once a month? b. If we randomly select 2 students at a time and record their drinking habits, what is the sample space corresponding to this experiment? What is the probability corresponding to each outcome in part (b)? c. d. Assuming that 5 students are selected at random, what is the probability that at least one person drinks once a month?
(a) The probability that a student does not drink once a month= 0.40
(b) The probability corresponding to each outcome would depend on the given relative probability
(c) You can calculate the value of this expression to find the probability that at least one person drinks once a month.
What is the probability that a student does not drink once a month ?a. The probability that a student does not drink once a month can be calculated as 1 minus the probability that a student drinks once a month, which is given as P(D) = 0.60.
So, P(not D) = 1 - P(D) = 1 - 0.60 = 0.40.
b. If we randomly select 2 students at a time and record their drinking habits, the sample space corresponding to this experiment would consist of all possible combinations of drinking habits for the two students.
Since each student can either drink once a month (D) or not drink once a month (not D), there are four possible outcomes:
Both students drink once a month (D, D)
Both students do not drink once a month (not D, not D)
The first student drinks once a month and the second student does not (D, not D)
The first student does not drink once a month and the second student drinks once a month (not D, D)
The probability corresponding to each outcome would depend on the given relative frequency or probability of a student drinking once a month (P(D)) and the complement of that probability (1 - P(D)).
c. Assuming that 5 students are selected at random, the probability that at least one person drinks once a month can be calculated using the complement rule.
The complement of the event "at least one person drinks once a month" is "none of the 5 students drink once a month" or "all 5 students do not drink once a month".
The probability that one student does not drink once a month is P(not D) = 0.40 (as calculated in part a).
The probability that all 5 students do not drink once a month is [tex](P(not D))^5[/tex], since the events are assumed to be independent.
So, the probability that at least one person drinks once a month is:
P(at least one person drinks once a month) = 1 - P(none of the 5 students drink once a month)
= 1 - [tex](P(not D))^5[/tex]
= 1 - [tex](0.40)^5[/tex] (after substituting the value of P(not D) from part a)
You can calculate the value of this expression to find the probability that at least one person drinks once a month.
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At a concert, 5 out of the first 20 people who entered the venue were wearing the band's
t-shirt. Based on this information, if 800 people attend the concert, how many people could
be expected to be wearing the band's t-shirt?
At a particular restaurant, each slider has 225 calories and each chicken wing has 70 calories. A combination meal with sliders and chicken wings has a total of 10 sliders and chicken wings altogether and contains 1165 calories. Write a system of equations that could be used to determine the number of sliders in the combination meal and the number of chicken wings in the combination meal. Define the variables that you use to write the system. Do not solve the system.
x+y=10
225x+70y=1165 where x represents the quantity of sliders in the combo.
The quantity of chicken wings in the combo is given by y.
What is equation?An equation is an expression of one or more variables equated to a constant or another expression. Equations are used in mathematics to describe the relationship between two or more variables and often involve operations such as addition, subtraction, multiplication, division, and exponents. Equations can also be used to describe physical phenomena and other phenomena such as chemical reactions, motion, and electricity.
Let x represent the number of sliders in the combination meal and let y represent the number of chicken wings in the combination meal. The system of equations used to determine the number of sliders and chicken wings in the combination meal is given by:
Equation 1: 225x + 70y = 1165
Equation 2: x + y = 10
This system of equations can be used to find the number of sliders and chicken wings in the combination meal. To solve this system, the equations must be manipulated to isolate one of the variables. For example, if we subtract 70y from both sides of Equation 1, we obtain 225x = 1165 - 70y. We can then divide both sides by 225 to obtain x = (1165 - 70y)/225. This expression can then be substituted into Equation 2 to obtain a single equation in one variable.
Therefore, the system of equations given by Equation 1 and Equation 2 can be used to determine the number of sliders and chicken wings in the combination meal.
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x+y=10
225x+70y=1165 where x represents the quantity of sliders in the combo.
The quantity of chicken wings in the combo is given by y.
What is equation?An equation is an expression of one or more variables equated to a constant or another expression. Equations are used in mathematics to describe the relationship between two or more variables and often involve operations such as addition, subtraction, multiplication, division, and exponents. Equations can also be used to describe physical phenomena and other phenomena such as chemical reactions, motion, and electricity.
Let x represent the number of sliders in the combination meal and let y represent the number of chicken wings in the combination meal. The system of equations used to determine the number of sliders and chicken wings in the combination meal is given by:
Equation 1: 225x + 70y = 1165
Equation 2: x + y = 10
This system of equations can be used to find the number of sliders and chicken wings in the combination meal. To solve this system, the equations must be manipulated to isolate one of the variables. For example, if we subtract 70y from both sides of Equation 1, we obtain 225x = 1165 - 70y. We can then divide both sides by 225 to obtain x = (1165 - 70y)/225. This expression can then be substituted into Equation 2 to obtain a single equation in one variable.
Therefore, the system of equations given by Equation 1 and Equation 2 can be used to determine the number of sliders and chicken wings in the combination meal.
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Problem D: Consider arranging the letters of FABULOUS. (a). How many different arrangements are there? (b). How many different arrangements have the A appearing anywhere before the S (such as in FABULOUS)? (c). How many different arrangements have the first U appearing anywhere before the S (such as in FABU- LOUS)? (d). How many different arrangements have all four vowels appear consecutively (such as FAUOUBLS)?
(a). 40,320 different arrangements can be made arranging the letters of FABULOUS.
(b). 5,760 different arrangements have the A appearing anywhere before the S (such as in FABULOUS).
(c). 1,440 different arrangements have the first U appearing anywhere before the S (such as in FABU- LOUS).
(d). 120 different arrangements have all four vowels appear consecutively (such as FAUOUBLS).
(a). The word FABULOUS has 8 letters, so there are 8! = 40,320 different arrangements of its letters.
(b). To count the number of arrangements where A appears before S, we can fix A in the first position and S in the last position. Then, we have 6 remaining letters to arrange in the 6 remaining positions. This gives us 6! = 720 possible arrangements where A appears before S.
However, we can also fix A in the second position and S in the last position, and we can fix A in the third position and S in the last position, and so on. Therefore, the total number of arrangements where A appears anywhere before S is 720 * 8 = 5,760.
(c). To count the number of arrangements where the first U appears before S, we can fix U in the first position and S in the last position, and then we have 6 remaining letters to arrange in the 6 remaining positions. This gives us 6! = 720 possible arrangements where the first U appears before S.
However, there are two U's in the word FABULOUS, so we can also fix the second U in the first position and S in the last position, and then we have 6 remaining letters to arrange in the 6 remaining positions. This also gives us 6! = 720 possible arrangements where the first U appears before S. Therefore, the total number of arrangements where the first U appears anywhere before S is 720 * 2 = 1,440.
(d). To count the number of arrangements where all four vowels appear consecutively, we can group the vowels together as one unit, so we have F, B, L, S, and the group AUOU. The group AUOU has 4 letters, so there are 4! = 24 different arrangements of these letters.
However, the group AUOU can appear in any of the 5 positions between F and B, between B and L, between L and S, after S, or before F. Therefore, the total number of arrangements where all four vowels appear consecutively is 24 * 5 = 120.
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Find the area of a regular pentagon with side length 9 m. Give the answer to the nearest tenth.
A. 27.9 m²
B. 111.5 m²
C. 278.7 m²
D. 139.4 m²
The Area of a regular pentagon will be "139.4 cm²". To understand the calculation, check below.
Regular PentagonAccording to the question,
Side length (a) = 9 cm
We know the formula,
[tex]\bold{Area} \ \text{of Pentagon} =\dfrac{1}{4} \sqrt{5(5+25)\text{a}^2}[/tex]
By substituting the values, we get
[tex]=\dfrac{1}{4} \sqrt{5(5+25)(9)^2}[/tex]
[tex]=\dfrac{1}{4} \sqrt{5(30)81}[/tex]
[tex]=\dfrac{1}{4} \sqrt{150\times81}[/tex]
[tex]= 139.36 \ \text{or}[/tex],
[tex]= 139.4 \ \text{m}^2[/tex]
Thus the above answer is correct.
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A 2-gallon container of laundry detergent costs $30. 40. What is the price per cup?
The price per cup of the 2-gallon container of laundry detergent costing $30.40 is $0.30 per cup.
To calculate the price per cup, we first need to convert 2 gallons to cups.
1 gallon = 16 cups
So, 2 gallons = 2 x 16 = 32 cups
Now, to find the price per cup, we divide the total price of the container by the number of cups in it:
Price per cup = Total price / Number of cupsPrice per cup = $30.40 / 32 cupsPrice per cup = $0.95/ cup (rounded to two decimal places)Therefore, the price per cup of laundry detergent is $0.30 per cup (rounded to two decimal places).
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complete the parametric equations of the line through the points (-2,8,7) and (-4,-5,-8)
The parametric equations for the line through the points (-2, 8, 7) and (-4, -5, -8) are:
x(t) = -2 - 2t
y(t) = 8 - 13t
z(t) = 7 - 15t
To find the parametric equations of the line through the points (-2, 8, 7) and (-4, -5, -8), you first need to find the direction vector of the line. To do this, subtract the coordinates of the first point from the second point:
Direction vector: (-4 - (-2), -5 - 8, -8 - 7) = (-2, -13, -15)
Now, write the parametric equations using the direction vector components and a point on the line, typically the first point:
x(t) = -2 + (-2)t
y(t) = 8 + (-13)t
z(t) = 7 + (-15)t
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What is the mean absolute deviation for the data set 5, 12, 17, 7, 7?
Answer:
mean ( averege) is the sum of the value divided by the number of value
mean= (5+12+17+7+7) / 5
=48/5
= 9.6
Answer:
The mean is the sum of the value divided by the number of the values.
i.e. mean = (5+12+17+7+7) / 5
=48/5
= 9.6
use the given information to find the values of the remaining five trigonometric functions. sin(x) = 3 5 , 0 < x < /2
The values of the remaining five trigonometric functions are:
cos(x) = 4/5
tan(x) = 3/4
csc(x) = 5/3
sec(x) = 5/4
cot(x) = 4/3.
Using the given information, we can use the Pythagorean identity to find the value of cos(x):
cos²(x) = 1 - sin²(x)
cos²(x) = 1 - (3/5)²
cos²(x) = 1 - 9/25
cos²(x) = 16/25
cos(x) = ±4/5
Since 0 < x < π/2, we know that cos(x) is positive, so cos(x) = 4/5.
Now we can use the definitions of the remaining trigonometric functions to find their values:
tan(x) = sin(x) / cos(x) = (3/5) / (4/5) = 3/4
csc(x) = 1 / sin(x) = 5/3
sec(x) = 1 / cos(x) = 5/4
cot(x) = 1 / tan(x) = 4/3
Therefore, the values of the remaining five trigonometric functions are:
cos(x) = 4/5
tan(x) = 3/4
csc(x) = 5/3
sec(x) = 5/4
cot(x) = 4/3.
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At the city museum, child admission is $5.30 and adult admission is $9.30. On Monday, 155 tickets were sold for a total sales of $1169.50. How many child tickets were sold that day?
Therefore, 68 child tickets were sold on Monday.
What is sales?Sales typically refer to the exchange of goods or services for money or other consideration, such as barter. It is the activity or process of selling products or services to customers. Sales can occur through various channels, such as in-person transactions, online transactions, phone orders, etc.
Let's assume that x represents the number of child tickets sold on Monday.
Then, the number of adult tickets sold can be represented as (155 - x), since the total number of tickets sold was 155.
The total revenue from child tickets can be represented as 5.30x, since the price of one child ticket is $5.30.
Similarly, the total revenue from adult tickets can be represented as 9.30(155 - x), since the price of one adult ticket is $9.30 and there were (155 - x) adult tickets sold.
The total sales revenue for the day was $1169.50, so we can write:
5.30x + 9.30(155 - x) = 1169.50
Expanding this equation gives:
5.30x + 1441.50 - 9.30x = 1169.50
Simplifying and solving for x, we get:
-4.00x = -272.00
x = 68
Therefore, 68 child tickets were sold on Monday.
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a population of gifted iq scores forms a normal distribution with a mean of μ = 120 and σ=10. for samples of n =16, what proportion of the samples will have means between 115 and 120?
The proportion of samples that will have means between 115 and 120 is 0.4772 or 47.72%.
To solve this problem, we need to use the Central Limit Theorem, which states that the sample means of a large sample size (n>30) from any population with a finite mean and variance will be approximately normally distributed with a mean equal to the population mean (μ) and a standard deviation equal to the population standard deviation (σ/sqrt(n)).
Here, the population mean (μ) = 120, and the population standard deviation (σ) = 10. We are given that the sample size (n) = 16, and we need to find the proportion of samples that will have means between 115 and 120.
First, we need to standardize the sample means using the z-score formula:
z = (x - μ) / (σ / sqrt(n))
where x is the sample mean.
For the lower limit of 115:
z1 = (115 - 120) / (10 / sqrt(16)) = -2
For the upper limit of 120:
z2 = (120 - 120) / (10 / sqrt(16)) = 0
We need to find the area under the standard normal distribution curve between z1 = -2 and z2 = 0. We can use a standard normal distribution table or a calculator to find this area.
Using a standard normal distribution table, we find that the area between z1 = -2 and z2 = 0 is 0.4772.
Therefore, the proportion of samples that will have means between 115 and 120 is 0.4772 or 47.72%.
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The proportion of samples that will have means between 115 and 120 is 0.4772 or 47.72%.
To solve this problem, we need to use the Central Limit Theorem, which states that the sample means of a large sample size (n>30) from any population with a finite mean and variance will be approximately normally distributed with a mean equal to the population mean (μ) and a standard deviation equal to the population standard deviation (σ/sqrt(n)).
Here, the population mean (μ) = 120, and the population standard deviation (σ) = 10. We are given that the sample size (n) = 16, and we need to find the proportion of samples that will have means between 115 and 120.
First, we need to standardize the sample means using the z-score formula:
z = (x - μ) / (σ / sqrt(n))
where x is the sample mean.
For the lower limit of 115:
z1 = (115 - 120) / (10 / sqrt(16)) = -2
For the upper limit of 120:
z2 = (120 - 120) / (10 / sqrt(16)) = 0
We need to find the area under the standard normal distribution curve between z1 = -2 and z2 = 0. We can use a standard normal distribution table or a calculator to find this area.
Using a standard normal distribution table, we find that the area between z1 = -2 and z2 = 0 is 0.4772.
Therefore, the proportion of samples that will have means between 115 and 120 is 0.4772 or 47.72%.
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: If f(x) = x^3 + 9x + 5 find (f^-1)'(5)
The value of (f^(-1))'(5) is 1/9, where f(x) = x^3 + 9x + 5.
How to find the derivative of the inverse function?To find the derivative of the inverse function at a particular point, we can use the formula:
(f^(-1))'(y) = 1 / f'(f^(-1)(y))
where y is the value at which we want to find the derivative of the inverse function.
In this case, we want to find (f^(-1))'(5), so we need to first find f'(x) and f^(-1)(5).
Starting with f'(x):
f(x) = x^3 + 9x + 5
Taking the derivative with respect to x, we get:
f'(x) = 3x^2 + 9
Now we need to find f^(-1)(5):
f(x) = 5
x^3 + 9x + 5 = 5
x^3 + 9x = 0
x(x^2 + 9) = 0
x = 0 or x = ±√(-9)
Since the inverse function is a function, it can only take one value for each input value, so we can discard the solution x = -√(-9), which is not a real number. Therefore, f^(-1)(5) = 0.
Now we can use the formula to find (f^(-1))'(5):
(f^(-1))'(5) = 1 / f'(f^(-1)(5)) = 1 / f'(0)
Substituting into the expression for f'(x), we get:
f'(x) = 3x^2 + 9
f'(0) = 3(0)^2 + 9 = 9
(f^(-1))'(5) = 1 / f'(f^(-1)(5)) = 1 / f'(0) = 1 / 9
So, (f^(-1))'(5) = 1/9
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The formula for the area of the shaded region on the diagram is: Area of the circle - Area of the square The area of the circle is 81.3 cm2 rounded to 1 decimal place. The area of the square is 16.1 cm2 truncated to 1 decimal place. Write the error interval for the area, a , of the shaded region in the form m < a < n
To find the area of the shaded region, we need to subtract the area of the square from the area of the circle:
Area of shaded region = Area of circle - Area of square
Area of shaded region = 81.3 - 16.1
Area of shaded region = 65.2 cm^2
The error interval for the area, a, of the shaded region can be found by considering the errors in the measurements of the areas of the circle and the square. For the area of the circle, the value is rounded to 1 decimal place, so the error is at most 0.05 cm^2 (half of the value of the smallest decimal place). For the area of the square, the value is truncated to 1 decimal place, so the error is at most 0.1 cm^2 (the value of the smallest decimal place).
Thus, the error interval for the area, a, of the shaded region is:
m < a < n
where:
m = 81.3 - 16.1 - 0.1 = 65.1 cm^2
n = 81.3 - 16.1 + 0.05 = 65.25 cm^2
Therefore, the error interval for the area, a, of the shaded region is:
65.1 < a < 65.25
Which statement is true?
Responses
A 493,235 > 482,634493,235 > 482,634
B 837,295 > 873,393837,295 > 873,393
C 139,048 > 139,084139,048 > 139,084
D 371,538 > 371,725371,538 > 371,725
Answer:
A
Step-by-step explanation:
22. testing for marijuana use if one of the test subjects is randomly selected, find the prob-ability that the subject tested negative or used marijuana
The required answer is Probability = 100 / 100 = 1
If one test subject is randomly selected, the probability that they tested negative or used marijuana can be found using the formula:
P(Negative or Marijuana) = P(Negative) + P(Marijuana) - P(Negative and Marijuana)
Assuming that the test is accurate, the probability of testing negative for marijuana use is typically high for non-users. Let's assume that this probability is 0.95.
On the other hand, the probability of testing positive for marijuana use is typically high for users. Let's assume that this probability is 0.75.
If we assume that the proportion of marijuana users in the sample is 0.2, we can use this to calculate the probability of a subject being a marijuana user and testing negative (0.05 x 0.2 = 0.01).
Using these probabilities, we can calculate the probability that the subject tested negative or used marijuana:
P(Negative or Marijuana) = 0.95 + 0.2 - 0.01 = 1.14
probabilities cannot be greater than 1, so we must adjust this probability by subtracting the probability of both events occurring (i.e., a marijuana user testing negative):
P(Negative or Marijuana) = 0.95 + 0.2 - 0.01 - 0.15 = 1.09
Therefore, the probability that the subject tested negative or used marijuana is 1.09 (or 109%). This is an incorrect probability, as probabilities cannot be greater than 1. It is likely that there is an error in the assumptions or calculations made, and further analysis is needed.
To find the probability that the subject tested negative or used marijuana, you will need to follow these steps:
This mathematical definition of probability can extend to infinite sample spaces, and even uncountable sample spaces, using the concept of a measure.
Step 1: Determine the total number of test subjects.
In this case, the total number of test subjects is not given, so we'll assume it's 100 for simplicity.
Step 2: Determine the number of subjects who tested negative and the number of subjects who used marijuana.
Let's assume 'x' test subjects tested negative and 'y' test subjects used marijuana. Since these are the only two options, x + y = 100.
Step 3: Calculate the probability that the subject tested negative or used marijuana.
The probability that the subject tested negative or used marijuana can be found by dividing the sum of subjects who tested negative and subjects who used marijuana (x + y) by the total number of subjects (100).
Probability = (x + y) / 100
Since x + y = 100, the probability of the subject tested negative or used marijuana is:
Probability = 100 / 100 = 1
Therefore, the probability that the subject tested negative or used marijuana is 1, or 100%.
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Find the solution of the given initial value problem.y'' − 2y' − 3y = h (t-4),, y(0) = 8, y'(0) = y'(0)=0Solve the given initial-value problem.d2xdt2+ ω2x = F0 sin ωt, x(0) = 0, x '(0) = 0
a)The solution to the given initial value problem is
[tex]y(t) = ((2h/27) + (4/3))e^(^3^t^) + ((2h/27) - (4/3))e^(^-^t^) - (h/3)(t-4) - (2h/9)[/tex]
b)The solution to the given initial value problem is
[tex]x(t) = (F0/(2ω^2))sin ωt - (F0/(2ω^2))cos ωt[/tex]
For the first problem, we can use the method of undetermined coefficients to find a particular solution to the non-homogeneous differential equation.
Let's assume that the solution has the form y_p = A(t-4) + B.
Taking the first and second derivatives, we have y'_p = A and y''_p = 0.
Substituting these expressions into the differential equation, we get:
[tex]0 - 2A - 3(A(t-4) + B) = h(t-4)[/tex]
To simplify, we have:
[tex]-3At + (6A - 3B) = h(t-4)[/tex]
To satisfy this equation for all t, we must have -3A = h and 6A - 3B = 0.
Solving for A and B, we get A = -h/3 and B = -2h/9.
Therefore, the particular solution is
[tex]y_p = (-h/3)(t-4) - (2h/9).[/tex]
To find the general solution to the homogeneous differential equation, we first solve the characteristic equation:
[tex]r^2 - 2r - 3 = 0[/tex]
Factoring, we get (r-3)(r+1) = 0, so r = 3 or r = -1.
Therefore, the general solution to the homogeneous equation is
[tex]y_h = c_1e^(^3^t^) + c_2e^(^-^t^).[/tex]
The general solution to the entire differential equation is the sum of the homogeneous and particular solutions:
[tex]y = y_h + y_p.[/tex]
Plugging in the initial conditions, we have:
[tex]y(0) = 8 = c_1 + c_2 - (2h/9)y'(0) = 0 = 3c_1 - c_2 - (h/3)[/tex]
Solving for c_1 and c_2 in terms of h, we get
c_1 = (2h/27) + (4/3) and c_2 = (2h/27) - (4/3).
Therefore, the solution to the initial value problem is:
[tex]y(t) = ((2h/27) + (4/3))e^(^3^t^) + ((2h/27) - (4/3))e^(^-^t^) - (h/3)(t-4) - (2h/9)[/tex]
For the second problem, we can use the method of undetermined coefficients again.
Let's assume that the solution has the form x_p = A sin ωt.
Taking the second derivative, we have [tex]d^2x_p/dt^2 = -Aω^2 sin ωt.[/tex]
Substituting these expressions into the differential equation, we get:
[tex]-Aω^2 sin ωt + ω^2A sin ωt = F0 sin ωt[/tex]
Simplifying, we get -2Aω^2 sin ωt = F0 sin ωt, so A = -F0/(2ω^2).
The general solution to the homogeneous differential equation is
[tex]x_h = c_1 cos ωt + c_2 sin ωt.[/tex]
Therefore, the general solution to the entire differential equation is
[tex]x = x_h + x_p.[/tex]
Plugging in the initial conditions, we have:
x(0) = 0 = c_1
x'(0) = 0 = c_2ω - (F0/(2ω))
Solving for c_2 in terms of F0 and ω, we get c_2 = F0/(2ω^2).
Therefore, the solution to the initial value problem is:
[tex]x(t) = (F0/(2ω^2))sin ωt - (F0/(2ω^2))cos ωt[/tex]
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find the volume of the solid in the first octant bounded by the parabolic cylinder z = 25 − x2 and the plane y = 1.
The volume of the solid in the first octant bounded by the parabolic cylinder z=25-x² and the plane y=1 is 32.33 cubic units (approximately).
To find the volume of the solid, we need to integrate the cross-sectional area of the solid with respect to x. Since the plane y=1 cuts the solid into two halves, we can integrate over the range 0 ≤ x ≤ 5.
For a fixed value of x, the cross-sectional area of the solid is given by the area of the ellipse formed by the intersection of the parabolic cylinder and the plane y=1. The equation of this ellipse can be obtained by substituting y=1 in the equation of the parabolic cylinder:
z = 25 - x² and y = 1Therefore, the equation of the ellipse is:
x²/25 + z²/24 = 1We can now integrate the cross-sectional area over the range 0 ≤ x ≤ 5:
V = ∫[0,5] A(x) dxwhere A(x) is the area of the ellipse given by:
A(x) = π (25-x²) (24)⁰°⁵Evaluating the integral, we get:
V = ∫[0,5] π (25-x²) (24)^0.5 dx= 24π [25 sin^-1(x/5) + x (25-x²)^0.5] / 3 |0 to 5= 32.33 (approx)Therefore, the volume of the solid in the first octant bounded by the parabolic cylinder z=25-x² and the plane y=1 is approximately 32.33 cubic units.
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suppose that f and g are continuouis function such that. ∫1 5 f(x)dx = 6
The area under the curve of the function f(x) between the points x = 1 and x = 5 is equal to 6 units.
Given that f is a continuous function and ∫1 5 f(x)dx = 6, we know that the area under the curve of f between 1 and 5 is equal to 6.
We don't have any information about g, so we can't say much about it. However, we can use the fact that f is continuous to make some deductions.
Since f is continuous, we know that it must be integrable on [1, 5]. This means that we can define another function F(x) as the definite integral of f(x) from 1 to x:
F(x) = ∫1 x f(t) dt
We can then apply the fundamental theorem of calculus to F(x) to get:
F'(x) = f(x)
In other words, F(x) is an antiderivative of f(x), so its derivative is f(x).
We can also use the fact that f is continuous to say that it must have an average value on [1, 5]. This average value is given by:
avg(f) = (1/4) ∫1 5 f(x) dx
Using the fact that ∫1 5 f(x)dx = 6, we can simplify this to:
avg(f) = (1/4) * 6 = 1.5
This means that on average, the value of f(x) between 1 and 5 is 1.5.
However, since we don't know anything else about f, we can't say much more than that.
Based on the given information, f and g are continuous functions and the definite integral of f(x) from 1 to 5 is equal to 6. In mathematical notation, it can be expressed as:
∫(from 1 to 5) f(x)dx = 6
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Given that (square root on them )a b*2 − c = 5k
find ________
a) the value of ‘k’ when a = 3, b = 6 and c = 20
b) the value of ‘c’ when a = 4, b = 7 and k = 11
In the expression, the values are:
a) k = 2.4
b) c = -141.0625
How to find the value of k in the expression?
We have the expression:
a√(b² − c) = 5k
a)For the value of ‘k’ when a = 3, b = 6 and c = 20, we have:
a√(b² − c) = 5k
3√(6² − 20) = 5k (solve for k)
3√(36 − 20) = 5k
3√(16) = 5k
3*4 = 5k
12 = 5k
k = 12/5
k = 2.4
b) For the value of ‘c’ when a = 4, b = 7 and k = 11, we have:
a√(b² − c) = 5k
4√(7² − c) = 5*11 (solve for c)
4√(49 − c) = 55
√(49 − c) = 55/4
√(49 − c) = 13.75
49 − c = 13.75²
49 - c = 189.0625
c = 49 - 189.0625
c = -141.0625
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37. Make a box and whicker plot of the following prices of some DVDs.
{10.99, 12.99, 15.99, 10.99, 26.99, 14.99, 19.99, 19.99, 9.99, 21.99, 20.99)
The box and whicker plot of the following prices of some DVDs is illustrated below.
To create a box and whisker plot, we first need to order the data from smallest to largest. Then, we can find the median, which is the middle value of the data set. In this case, the median is 18.99.
Next, we can find the lower quartile (Q1) and upper quartile (Q3), which divide the data set into four equal parts. Q1 is the median of the lower half of the data, and Q3 is the median of the upper half of the data. In this case, Q1 is 12.99 and Q3 is 21.99.
With these values, we can draw a box that represents the middle 50% of the data, with the bottom of the box at Q1 and the top of the box at Q3. Inside the box, we draw a line at the median. This box shows the interquartile range (IQR), which is a measure of the spread of the data.
Finally, we can draw whiskers that extend from the box to the minimum and maximum values that are not considered outliers. Outliers are data points that are more than 1.5 times the IQR away from the box. In this case, the minimum value is 9.99 and the maximum value is 26.99, but since 26.99 is an outlier, we only draw a whisker up to the next highest value, which is 21.99.
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let a = {1, 2, 3, 4, , 18} and define a relation r on a as follows: for all x, y ∈ a, x r y ⇔ 4|(x − y).
The relation R defined on set A={1,2,3,...,22} as xRy ⇔ 4|(x-y) is an equivalence relation. The equivalence classes are {1,5,9,13,17,21}, {2,6,10,14,18,22}, {3,7,11,15,19}, and {4,8,12,16,20}.
Since R is an equivalence relation on A, it partitions A into disjoint equivalence classes.
The equivalence class of an element a ∈ A is the set of all elements in A that are related to a under R.
Using set-roster notation, we can write the equivalence classes of R as follows
[1] = {1, 5, 9, 13, 17, 21}
[2] = {2, 6, 10, 14, 18, 22}
[3] = {3, 7, 11, 15, 19}
[4] = {4, 8, 12, 16, 20}
Each equivalence class contains all elements that are congruent modulo 4.
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--The given question is incomplete, the complete question is given
" Let A = {1, 2, 3, 4, , 22} And define a relation R on A as follows
For all x, y ∈ A, x R y ⇔ 4|(x − y).
It is a fact that R is an equivalence relation on A. Use set-roster notation to write the equivalence classes of R."--
Determine the constant of proportionality for the relashionship.
Answer:
P=70
Step-by-step explanation:
because when you divide y by x you get 70
140 divided by 2 is 70.
Answer:
**NEED ANSWER ASAP DUE TOMORROW**
What are two observations of quasars that prove they cannot be a part of the milky way galaxy?
Step-by-step explanation:
what are the new limits of integration after applying the substitution =6 to the integral ∫0sin(6 )? (express numbers in exact form. use symbolic notation and fractions where needed.)
The new limits of integration are from u=0 to u=6sin(6) after the substitution u=6x is applied. The integral evaluates to (1/6)[cos(6sin(6))+1].
Let us assume the substitution u = 6x.
First, we need to find the new limits of integration by substituting u=6x into the original limits of integration:
When x=0, u=6(0) = 0.
When x=sin(6), u=6sin(6).
Therefore, the new limits of integration are from u=0 to u=6sin(6).
Next, we need to express the integral in terms of u by substituting x back in terms of u:
When x=0, u=6(0) = 0, so x=u/6.
When x=sin(6), u=6sin(6), so x=u/6.
Therefore, we have:
∫0sin(6) dx = (1/6) ∫0⁶ sin(6u/6) du
Simplifying, we get:
(1/6) ∫0⁶ sin(u) du
which evaluates to:
(1/6) [-cos(u)] from 0 to 6sin(6)
Plugging in the limits of integration, we get:
(1/6) [-cos(6sin(6)) + cos(0)]
which simplifies to:
(1/6) [-cos(6sin(6)) + 1]
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The new limits of integration are from u=0 to u=6sin(6) after the substitution u=6x is applied. The integral evaluates to (1/6)[cos(6sin(6))+1].
Let us assume the substitution u = 6x.
First, we need to find the new limits of integration by substituting u=6x into the original limits of integration:
When x=0, u=6(0) = 0.
When x=sin(6), u=6sin(6).
Therefore, the new limits of integration are from u=0 to u=6sin(6).
Next, we need to express the integral in terms of u by substituting x back in terms of u:
When x=0, u=6(0) = 0, so x=u/6.
When x=sin(6), u=6sin(6), so x=u/6.
Therefore, we have:
∫0sin(6) dx = (1/6) ∫0⁶ sin(6u/6) du
Simplifying, we get:
(1/6) ∫0⁶ sin(u) du
which evaluates to:
(1/6) [-cos(u)] from 0 to 6sin(6)
Plugging in the limits of integration, we get:
(1/6) [-cos(6sin(6)) + cos(0)]
which simplifies to:
(1/6) [-cos(6sin(6)) + 1]
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