While constructing a confidence interval for the mean, when the population standard deviation is unknown, then we use normal distribution .
The error bound EBM and confidence interval are calculated using a standard normal distribution when the population standard deviation is unknown. We must determine the value of z that places an area in the centre of the standard normal distribution Z N that is equal to the confidence level (in decimal form) (0, 1).
We rarely know the population standard deviation in practise. When the sample size was huge is the , statisticians were not hindered by this. As an estimate for, they used the sample standard deviations, and they then carried out the same steps as before to compute a confidence range that produced near enough findings.
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Arturo compro una calculadora, para venderla recargó el precio que le costo en 30%. Al momento de venderla a su amiga Carmen, le hizo una rebaja de 30% pensando que con esta rebaja iba a vender el precio que habia comprado, pero sin embargo quedó peerjudicado en s/ 54.¿ A qué precio se vendio?
Answer:
5.46
Step-by-step explanation:
precio original = x
0.7(1.3x) = x - 0.54
0.91x - x = -0.54
x = 6
6 + 30% de 6 = 7.8
7.8 - 30% de 7.8 = 5.46
Arturo compró por 6.
Aumentó 30% para 7.80.
Bajó 30% para 5.46.
6 - 5.46 = 0.54
Of the 400 students in the 8th grade, four-fifths have purchased tickets for the end of year trip. If there needs to be two chaperones for every 75 students, how many chaperones are needed?
The number of chaperones that are needed is 128/15.
What is unitary method?
The unitary approach is a strategy for problem-solving that involves first determining the value of a single unit, then multiplying that value to determine the required value.
Given that the number of students in 8th grade is 400.
Four fifth of total number of students go for trip.
The number of student who goes for the trip is 400 × 4/5
= 320.
To carry 75 students, we need 2 chaperones.
Apply unitary method:
To carry 1 student, we need 2/75 chaperones.
To carry 320 students, we need (2 ×320)/75 chaperones.
= (2 × 64)/15
= 128/15
= 8.533
= 9
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where is the inequality shown? -4 to 5, 100 points for correct answer and need it urgently
Question content area left
Part 1
On a math test Ali needs to describe the motions which map ΔEFG to ΔMNO. The coordinates of ΔEFG are E(6,5), F(9,5), and G(6,10). The coordinates of ΔMNO are M(0,0), N(−3,0), and O(0,5). He says there is a translation 6 units to the left and 5 units down, followed by a reflection across the x-axis. Describe the sequence of rigid motions. What is Ali's likely error?
-10
-5
5
10
-10
-5
5
10
x
y
E
F
G
M
N
O
x y graph
.
.
.
Question content area right
Part 1
Which of the following is the description of the rigid motions which maps ΔEFG to ΔMNO?
A.
A translation 6 units to the left and 5 units down, followed by a reflection across the x-axis
B.
A translation 6 units to the left and 5 units down, followed by a reflection across the y-axis
C.
A translation 5 units to the left and 4 units down, followed by a reflection across the y-axis
Part 2
What is Ali's likely error?
A.
He reflected the triangle across the wrong axis.
B.
He did not move the correct units down.
C.
He did not move the correct units to the left.
There is a translation 6 units to the left and 5 units down, followed by a reflection across the x-axis is the description of the rigid motions which maps ΔEFG to ΔMNO and he reflected the triangle across the wrong axis is the Alis error.
What is Graph?Graph is a mathematical representation of a network and it describes the relationship between lines and points.
Given,
The coordinates of ΔEFG are E(6,5), F(9,5), and G(6,10).
The coordinates of ΔMNO are M(0,0), N(−3,0), and O(0,5)
A translation is a movement of the graph either horizontally parallel to the -axis or vertically parallel to the -axis
Reflections of graphs involve reflecting a graph over a specific line. Reflecting functions are functions whose graphs are reflections of each other.
There is a translation 6 units to the left and 5 units down, followed by a reflection across the x-axis is the description of the rigid motions which maps ΔEFG to ΔMNO and he reflected the triangle across the wrong axis is the Alis error.
Hence, there is a translation 6 units to the left and 5 units down, followed by a reflection across the x-axis is the description of the rigid motions which maps ΔEFG to ΔMNO and he reflected the triangle across the wrong axis is the Alis error.
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The points (d, 7) and (0, 10) fall on a line with a slope of 1/3. What is the value of d?
The value of missing coordinate d of the point (d, 7) in the line such that its slope is 1 / 3 is - 9.
What are the missing coordinates that satisfies a given slope?
In this problem we must determine the value of the missing coordinates of a point in a line such that its slope is 1 / 3. The slope of the line can be determined by means of the secant line formula:
m = Δy / Δx
Where:
Δx - Change in the x-coordinates.Δy - Change in the y-coordinates.If we know that (x₁, y₁) = (d, 7), (x₂, y₂) = (0, 10) and m = 1 / 3, then the missing coordinate is:
1 / 3 = (10 - 7) / (0 - d)
1 / 3 = - 3 / d
d = - 9
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PLEASE HELP ME ASAP!!!! PLEASE I WILL GIVE YOU BRAINLIST!!!
LM is translated 5 units right and 2 units up to LM' as the graph shows the move in positive direction.
What is graph?In elementary mathematics, the term "graph" designates a plot or a function graph. A graph is, in the language of mathematicians, a set of points and the connections between some subset of those points (which may be empty). In mathematics, a graph is a visual representation or diagram that shows facts or values in an ordered way. The relationships between two or more items are frequently represented by the points on a graph.
Here,
As the graph indicates a move in the right direction, LM is translated 5 units right and 2 units up to LM'.
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One of the same side interrier angles of two paralell lines is 20 degrees less than the other sameside interior angle. Find the measures of the two angles.
Interior angles on the same side are supplementary, which means they add up to 180°. We can write the equation as follows and refer to the two angles as x° and (x + 20)°.
What are angles?When two rays are linked at their ends, they create an angle in geometry. The sides or arms of the angle are what are known as these rays.
When two lines meet at a point, an angle is created.
An "angle" is the measurement of the "opening" between these two rays. It is symbolized by the character. The circularity or rotation of an angle is often measured in degrees and radians.
Angles are a common occurrence in daily life.
Angles are used by engineers and architects to create highways, structures, and sports venues.
According to our question-
x + x + 20 = 180
2x + 20 = 180
2x = 160
If x = 80, the angles are 80° and 80 + 20 = 100°, respectively.
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Find sin D, sin E, cos D, and cos E. Write each answer as a fraction in simplest form.
Answer:
7 5 15 22
step,by step explanation: yes
Consider the following argument:
Observation: Here in Nashville, the sun has risen every morning.
Conclusion: The sun is going to rise in Nashville tomorrow.
The argument is strong because there are a large number of observations
In the given argument and condition, (D) there are several observations, which strengthen the argument.
What is an argument?An argument is a statement or set of claims, known as premises, that seeks to evaluate the plausibility or acceptability of a conclusion.
The logical, dialectical, and rhetorical perspectives are the three basic areas of study for arguments.
Giving an argument entails offering a group of premises as justifications for believing the conclusion.
It's not always necessary to criticize or insult someone when making an argument.
Arguments can also be employed to back up the beliefs of others.
An example of an argument is as follows:
You should put in a lot of effort if you want to find a decent career.
So, in the given argument and condition, (D) there are several observations, which strengthen the argument.
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Complete question:
Consider the following argument:
Observation: Here in Nashville, the sun has risen every morning. Conclusion: The sun is going to rise in Nashville tomorrow.
a. The argument is weak because there is only one specific case.
b. The argument is strong because the premise includes scientific evidence.
c. The argument is weak because the observation does not consider other cities.
d. The argument is strong because there are a large number of observations.
Given ∠3≅∠4
Which of the following statements cannot be proved
∠1≅∠2
∠F≅∠2
∠1+∠4≅∠2+∠3
∠1+∠2≅∠3+∠4
Answer:
∠1+∠2≅∠3+∠4 cant be proven because sum of two obtuse angles is sure to be greater than sum of two acute angles of a triangle.
Lori gets an offer from another bank that is also paying 6% on CD’s, but is compounding interest daily. How much will the $1500 CD be worth in:
a) 5 years?
b) 10 years?
c) 18 months?
[tex]A=P(1+\frac{r}{n})^{nt}[/tex]
P = $1,500
r = 0.06
n = 365 times per year
t = varies
so: [tex]A(t)=\$1500(1+\frac{0.06}{365})^{365t}=\$1500(1.00016438)^{365t}[/tex]
a) A(5) = [tex]\$1500(1.00016438)^{365*5} = \$2,024.73[/tex]
b) A(10) = [tex]\$1500(1.00016438)^{365*10} = \$2,733.01[/tex]
c) 18 months = 1.5 years, so:
A(1.5) = [tex]\$1500(1.00016438)^{365*1.5} = \$1,641.25[/tex]
pls help me with math i’ll give you brainlist :)))
The required number of candles Marcella has in the starting is 56.
What are equation models?The equation model is defined as the model of the given situation in the form of an equation using variables and constants.
Here,
As mentioned in the question,
She has some candles in the starting before she starts collecting the candles, let x be the candle she had in the starting,
Now,
According to the question she is buying 13 candles every week, at the end of 8 weeks she has 160 candles,
So.
x + 13(8) = 160
x + 104 = 160
x = 160 - 104
x = 56
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A person whose eyes are 1.64 m above the floor stands 2.30 m in front of a vertical plane mirror whose bottom edge is 38 cm above the floor. What is the horizontal distance x?
When the floor is 2.30 m in front of a vertical plane mirror and the bottom edge of the mirror is 38 cm above the floor, the horizontal distance from the mirror's base to the wall is 0.6935 m.
What is trigonometry?Trigonometry is the study of angles and the angular relationships between planar and three-dimensional shapes. The cosecant, cosine, cotangent, secant, sine, and tangent are among the trigonometric functions (also known as the circle functions) that make up trigonometry.
Here,
Perpendicular Length,
=Vertical Distance of eyes - Vertical distance of the bottom edge of the mirror
=1.64-0.38
=1.26 m
Angle of Reflection,
= Perpendicular Distance / Distance between the person and mirror
tan θ=1.26/2.30
tan θ=0.548
θ=tan⁻¹(0.548)
θ=28.72°
Angle of Incidence = 90 degrees - angle of reflection
=90-28.72
γ=61.28°
Angle of incidence,
=Horizontal distance to floor / height of mirror
tan 61.28°=x/0.38
x=0.38*tan 61.28°
x=0.38*1.825
x=0.6935 m
The horizontal distance to the base of the wall is 0.6935 m when the floor stands 2.30 m in front of a vertical plane mirror whose bottom edge is 38 cm above the floor.
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Simplify the following equation:
17/6 = -1 2/3 + x
Answer: x=27/6
Step-by-step explanation:
-1 2/3 = -5/3
17/6 = -5/3 + x
x = 17/6 + 5/3
x = 17/6 + 10/6
x = 27/6
Match the amplitude, midline, period, and frequency for the cosine equation.
Amplitude is 5, midline is 3, period is π and the frequency is 2
We can describe the cosine function as y = Acos(B(x + C )+ D
where,
amplitude is A
Frequency is B
period is 2π/B
phase shift is C (positive is to the left)
vertical shift is D
Step 1:
Identify
5 cos(2x) + 3 → Acos(B(x + C )+ D
Hence
A = 5 = Amplitude
B = 2.C = 0. So,
Period = 2π / B
= 2π / 2 = π
Period = π
Frequency = B = 2
Vertical shift = D = 3
Step 2:
Midline
The equation of the midline of periodic function is the average of the maximum and minimum values of the function.
a) we have a maximum when
cos(2x) = 1
x =0, because (cos 0) = 1 Now, replace
y = 5 cos(2x) + 3
y = 5cos(2. 0 ) +3
= 5.1 + 3
= 8
So, the maximum is 8
b) we have a minimum when
cos(2x) = -1
x = π/2 , because
cos(2.π/2) = cos(π) = -1
Now, replace
y = 5cos(2.π/2) + 3
= 5. (-1) + 3
= -5+3
= -2
So, the midline is the average of 8 and -2
Midline = y = [8 + (-2)] / 2
= 6/2
y = 3
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PLSSSS HELP THX U !!!!!!
The lowest price that Mike should pay for 7 days' juice consumption is £6.16.
How to calculate the cost per item?In order to calculate the cost of one item, divide the total cost of items by the total number of items. It is also called the unit rate of that item.
The per day requirement of Mike is 2/5 liters.
Then, for 7 days the requirement is 2/5 × 7 = 14/5 liters.
The rate of juice for 2 liter and 1 liter carton are given as £4.40 and £2.60 respectively.
Then, the unit rate for both the carton is given by 4.40/2 = £2.20 and £2.60 respectively.
Since, the two liter carton has less unit rate, it can be used for 7 days consumption.
Now, the lowest price paid by mike is given as,
Unit rate of 2 liter carton × Total requirement of milk for 7 days
⇒ 2.20 × 14/5
⇒ 6.16
Hence, the lowest price paid by mike is £6.16.
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Which graph represents the function f(x) = 2x-1/ x-1
To determine which graph represents the function [tex]$f(x)=\frac{2 x-1}{x-1}$[/tex]make following steps:
What is function?
A function is a type of rule that produces one output for a single input. Source of the image: Alex Federspiel. This is illustrated by the equation y=x^2. Any input for x results in a single output for y. Considering that x is the input value, we would state that y is a function of x.
Four main categories may be used to classify different sorts of functions. dependent upon element Function is defined as one to one, many to one, onto, one to one and into function.
1. The vertical asymptote is x=1.
2. Simplify the function[tex]f(x)=\frac{2 x-1}{x-1}=\frac{2 x-1-1+1}{x-1}=\frac{2(x-1)+1}{x-1}=2+\frac{1}{x-1}$[/tex].
Then the horizontal asymptote is y=2.
Only option C contains graph with such asymptotes.
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Luis bought some milk for his bakery. He used 2.4 gallons in one recipe, and 1/4 of the remaining miolk in another recipe. He had 3/8 of the milk left. How much milk did Luis buy?
From the values provided and basic arithmetic operations on the fractions, The answer is 4.8 gallons.
What are fractions?An element of a whole is a fraction. The number is represented mathematically as a quotient, where the numerator and denominator are split. Both are integers in a simple fraction. A fraction appears in the numerator or denominator of a complex fraction. The numerator of a proper fraction is less than the denominator.
What are equations?The definition of an equation in algebra is a mathematical statement that demonstrates the equality of two mathematical expressions.
milk brought = x
used in one recipe = 2.4
1/4 th of remaining milk = (x-2.4)/4
remaining at end = 3/8 of x
final equation,
x-(2.4+(x-2.4)/4)=3x/8
5x/8=2.4+x/4-3/5
5x/8=1.8+x/4
3x/8=1.8
x=4.8 gallons
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URGENT!! ILL GIVE BRAINLIEST!!!! AND 100 POINTS!!!
What value of x would make these two solids similar?
A. X=27
B. X=31
C. X=30
D. X=7.75
Value of x would make these two solids similar when x is equal to 7.75.
Define similarity.When it comes to Euclidean geometry, two things are said to be similar if they have the same shape or the same shape as each other's mirror image. One can be created from the other more precisely by evenly scaling, possibly with the inclusion of further translation, rotation, and reflection. If two figures have the same shape, they are said to be comparable. In more formal terms, two figures are said to be comparable if their respective angles are congruent and their corresponding side length ratios are identical. The scale factor is the name given to this usual ratio.
Given
Two figures given
Value of x would make these two solids similar
D. X=7.75
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Let's compare
5/8 and 7/10
Answer:
5/8=25/40 7/10=28/40
Step-by-step explanation:
5/8<7/10
g(t)=3t+4 Find g(-3)
IfGH=72- 1andBC=4z- 3,whatisGH?
The length of the line segment GH is 34 units
How to determine the length GH?The complete question is added at the end of this solution
From the question, we have the following parameters that can be used in our computation:
GH= 7z - 1
BC = 4z - 3
Also from the question, we understand that the line segment BC is half the line segment GH
This can be represented mathematically as follows
BC = 1/2 * GH
Substitute the known values in the above equation, so, we have the following representation
4z - 3 = 1/2(7z - 1)
Multiply through by 2
8z - 6 = 7z - 1
Collect the like terms
8z - 7z = 6 - 1
Evaluate the like terms
z = 5
Recall that
GH= 7z - 1
Substitute the known values in the above equation, so, we have the following representation
GH= 7 * 5 - 1
Evaluate
GH= 34
Hence, the length is 34 units
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Complete question
The line segment BC is half the line segment GH
If GH = 7z- 1 and BC=4z- 3,
What is GH?
Find the missing length.
c=√?
Pythagorean Theorem: a²+b²=c²
After using the Pythagorean theorem the missing length of c is √148
What is the Pythagorean theorem in plain English?
In a right-angled triangle, the square of the hypotenuse side is equal to the sum of the squares of the other two sides, according to Pythagoras's Theorem. These triangle's three sides are known as the Perpendicular, Base, and Hypotenuse.
How may the Pythagorean Theorem be demonstrated the simplest way?
Angles CAB, AC'B, and AB'C must be equal in order for AC2 + AB2 to equal BC(CB' + BC'). Triangles ABC, AC'B, and AB'C are indeed comparable. Since AB/BC' = BC/AB and AC/CB' = BC/AC, we have the necessary identity right away. Theorem reduces to Pythagorean proposition and proof if angle A is correct.
Pythagorean Theorem: a²+b²=c²
so (12)^2+(2)^2 = 144+4 = 148
c²=148
c=√148
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Mr. Hansen has three sticks that measure 5 inches, 10 inches and 17 inches. If he connects the sticks ends, will the three sticks form a triangle?
The three sticks will not form a triangle.
What is the triangle inequality theorem?
The triangle inequality theorem explains the connection between a triangle's three sides. This theorem states that for any triangle, the sum of the lengths of the first two sides is always greater than the length of the third side. In other terms, this theorem states that a straight line is always the shortest distance between any two places.
Given, Mr Hansen has three sticks that measure 5 inches, 10 inches and 17 inches
From the above definition of the Triangle inequality theorem,
Sum of two sides = 5 + 10 = 15 which is less than
the length of the third side = 17
So, the three sticks will not form a triangle.
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WRITE THE EQUATION OF THE CONIC SHOWN
Answer:
x² +y² -10x -8y +21 = 0
Step-by-step explanation:
try desmos graph
Drag each object to show whether cost is proportional to area in the situation represented.
Increasing the area from 400 to 600 (50%) results in an increase in cost from 500 to 750 (50% increase), which shows that the cost is not proportional to the area.
In a situation where cost is proportional to area, the relationship between cost and area is said to be directly proportional. Direct proportionality means that if the value of one variable (in this case, area) is multiplied by a certain factor, then the other variable (in this case, cost) will also be multiplied by the same factor. The mathematical formula for direct proportionality is [tex]y = kx,[/tex] where y and x are the two variables, and k is the constant of proportionality. If the relationship between the variables is not proportional, then it is a non-proportional relationship.
The objects are proportional if increasing one quantity by a certain factor results in the other quantity increasing by the same factor. In this case, cost is proportional to area if doubling the area would double the cost. Based on the table, we can see that the cost is not proportional to the area since the cost does not increase by the same factor as the area. For example, increasing the area from 400 to 800 (double) results in an increase in cost from 500 to 1000 (also double). However, increasing the area from 400 to 600 (50%) results in an increase in cost from 500 to 750 (50% increase), which shows that the cost is not proportional to the area.
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ents
Select all of the triangles that are congruent to triangle A by the SSS postulate.
A
B
HHH
A A
G
O Triangle H
O Triangle D
O Triangle I
O Triangle C
O Triangle F
O Triangle B
O Triangle E
O Triangle G
À l
H
HE
Answer:
Triangle B
Step-by-step explanation:
The triangles have three pairs of congruent sides.
How many reflections symmetries does a decagon shaped like a five- pointed star have? How many rotational symmetries does the decagon have? Draw the reflection symmetries on the decagon.
Decagon has a total of 5 reflection symmetries
A reflection symmetry of a shape is a line that divides the shape into two halves that are mirror images of each other. To find the number of reflection symmetries of the decagon, we can draw lines through the center of the decagon that pass through pairs of opposite vertices.
We can draw a total of 5 lines through the center of the decagon that pass through pairs of opposite vertices. Each of these lines is a reflection symmetry of the decagon. Therefore, the decagon has a total of 5 reflection symmetries.
A rotational symmetry of a shape is a rotation about a fixed point that leaves the shape unchanged.
To find the number of rotational symmetries of the decagon, we can count the number of times we can rotate the decagon about its center by 36 degrees (which is the central angle of the decagon) and obtain the same shape. In this case, we can rotate the decagon about its center by 36 degrees 10 times and obtain the same shape each time.
A decagon shaped like a five-pointed star has 10 sides and 5 vertices, and it looks like this:
unitsize (1.5 cm);
pair A, B, C, D, E, F, G, H, I, J;
A = dir(108);
B = dir(72);
C = dir(36);
D = dir(0);
E = dir(-36);
F = dir(-72);
G = dir(-108);
H = dir(-144);
I = dir(-180);
J = dir(-216);
draw(A--B--C--D--E--F--G--H--I--J--cycle);
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Each year caronline deposited a certain amount of money in an account which pays an annual interest rate of r so that at the end of each year, the balance in the account is multiplied by a growth factor of x=1+r. $600 is deposited at the start of the first year, and $200 at the start of the following year. Write an expression for a value of the account at the end of three years in terms of growth factors x. Find the value at the end of 3 years if the interest rate is 4%.
Iris’s checking account pays a simple interest at 2% per year. She has $175 in her account. Write a linear function to model the amount of money in her checking account at any time
The expression to model the amount of money will be 175 ^ 1.02^t.
What is the expression to model the amount?An expression simply refers to the mathematical statements which have at least two terms which are related by an operator and contain either numbers, variables, or both. Addition, subtraction, multiplication, and division are all possible mathematical operations.
Since Iris’s checking account pays a simple interest at 2% per year. She has $175 in her account.
The function to model the amount of money in her checking account at any time will be:
= 175 ^ (1 + 2%)^t
= 175 ^ (1 + 0.02)^t
= 175 ^ 1.02^t
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