Your first step of simplifying is to distribute the "–" or "–1" in front of the second set of parentheses through that second set of parentheses. The –1 must be distributed to every term in the second set:
[tex]\begin{aligned}(4x^2-5x)-(4x^2-4x-8)&=(4x^2-5x)\boldsymbol{{}-1}(4x^2-4x-8)\\[0.5em]&=4x^2-5x\boldsymbol{{}-1(4x^2)-1(-4x)-1(-8)}\\[0.5em]&=4x^2-5x\boldsymbol{{}-4x^2+4x+8}\\[0.5em]&=-x+8\\\end{aligned}[/tex]
That's what changes the sign on every term in the second set of parentheses, making that –8 become +8.
In a primary school class, the ratio
of boys to girls is 3: 4. If there are
12 girls in the class, what is the total
number of students in the class?
Which congruence theorem can be used to prove △abc ≅ △def? aas asa hl sas
As per the congruence theorem, we have proved that ΔABC ≅ΔDEF.
In math congruence theorem states that if all the three sides of one triangle are equal to all the three sides of another triangle, then both the triangles are congruent to each other.
Here we need to prove ΔABC ≅ΔDEF by using the congruence theorem.
Here we have given that ΔABC and ΔDEF,
=> ∠B≅∠E [right angle]
So, we have obtained that
=> ∠A≅∠D
As we know that there is two angles and one non included side of ΔABC is congruent the two corresponding angles and one non- included side of ΔDEF, therefore, by AAS congruence rule.
So, based on the given fact we have identified that
=> ΔABC ≅ΔDEF
Therefore, the AAS congruence postulate defined that the triangles are congruent if two pairs of corresponding angles and a pair of opposite sides are equal in both triangles.
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solve the inequality
solve for q
–2.01–q>4.86
Answer:q<-6.87
Step-by-step explanation:
isolate q by adding 2.01 to both sides
-q>6.87
divide by side by -1, and since it is negative flip the sign
q<-6.87
(-5)+8 x 2 please help
Answer:
11
Step-by-step explanation:
-5 + 8 x 2
Do multiplication first because PEMDAS -5 + 16
Then add: 11
Answer:
11
Step-by-step explanation:
8x2 = 16
-5+16 = 11
If you do a question like this always use PEMDAS. Do it in order.
P arenthesis
E exponents
M ultiplcation
D ivision
A ddition
S ubtraction
10. Unlocked for sale The "sold" listings on a popular auction website included 20 sales of used "unlocked" phones of one popular model. Here are the sales prices. 450 415 495 300 325 430 370 400 325 400 235 330 304 415 405 449 355 425 299 355 (a) Find the percentile of the phone that sold for $330. (b) What was the sales price of the phone that was at the 75th percentile?
a) The percentile of the phone that sold for $330 is; 29%
b) The sales price at 75th percentile is; $425
How to find the percentile?In statistics, a percentile is a term that describes how a score compares to other scores from the same set.
From the given set of data showing the sales prices, let us sort them out from smallest to largest;
Sort the data values from smallest to largest:
235, 299, 300, 304, 325, 325, 330, 345, 355, 355, 370, 400, 400, 405, 415, 415, 425, 430, 449, 450, 495
It should be noted that 6 of the 21 data values are smaller than 325.
The percentile is then the number of data values that are less than the individual's data value divided by the number of data values in total, written as a percentage.
Thus;
Percentile = (Total number of data values/Number of data values that are less than the individual’s data value) × 100%
= 6/21 × 100%
≈ 0.2857 × 100%
= 28.57 % ≈ 29%
At 75th percentile, we have;
0.75 = x/21
x = 21 * 0.75
x = 15.75
Thus, the selling price of the phone at the 75th percentile is greater than 16 of the 21 phones. This phone has a selling price of at least $425
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Which of the following is true about the function y=log4 (x+16)-1?
(1) It has an x-intercept of 4 and a y-intercept of -1.
(2) It has x-intercept of -12 and a y-intercept of 1.
(3) It has an x-intercept of -16 and a y-intercept of 1.
(4) It has an x-intercept of -16 and a y-intercept of -1.
For the function, y = log₄ (x + 16) - 1, it has x-intercept of -12 and y-intercept of 1.
What are Logarithmic Functions?Logarithmic functions are functions expressed in another way for exponential functions. It is the power to which any number should be raised to yield other values.
Logₐ x = n can be written in exponential form as x = aⁿ.
y = log₄ (x + 16) - 1
x-intercept is the x-coordinate of the point when y = 0.
0 = log₄ (x + 16) - 1
For the left hand side to be equal to 0, the term log₄ (x + 16) must be equal to 1.
log₄ (x + 16) = 1
⇒ x + 16 = 4 (∵ logₐ a = 1)
⇒ x = -12
y-intercept is the y-coordinate of the point where x = 0.
y = log₄ (0 + 16) - 1
y = log₄ (16) - 1
y = log₄ (4²) - 1
logₐ mⁿ = n logₐ m
⇒ y = 2 log₄ (4) - 1
⇒ y = 2 - 1 (∵ log₄ (4) = 1)
⇒ y = 1
Hence, the function y = log₄ (x + 16) - 1 has x-intercept of -12 and y-intercept of 1.
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Pick the most affordable gift (select the cheapest one): A) Laptop that originally cost $2399.99, has a discount of 40% and a sales tax of 8.2% B) A smart TV that originally cost $1799.99, has a discount of 10% and a sales tax of 4.5% C) A brand new Iphone that regularly costs 1699.99, has a 5% discount and a sales tax of 6.8% D) A GeForce 3090 RTX graphics card costs $2199.99, you have a coupon for $500 off. The sales tax is 7.5% A D B&C C B C&D
Option A) Buying a laptop will be most affordable among all the options as per the Selling price with Sales tax included.
What is Selling Price and Discount and Sales Tax?The selling price is the price at which a thing is sold. Typically, it is identified as SP. also known as a selling price on occasion.
Shop owners essentially mark this as a promotional item to give discounts to customers in a way that,
Discount equals Marked Price - Selling Price, and Discount Percentage is (Discount/Marked price) times 100.When a product is sold to a buyer, the government levies sales tax (abbreviated as ST). This tax will be collected by the merchant and paid to the government. As a result, it is added to the bill after being charged on the item's selling price.
Sales tax = Tax% of Bill AmountTotal Bill = Cost of the Item + Sales TaxFor Laptop,
Selling Price = (100-40)% of 2399.99
= 60% of 2399.99 = $ 1439.99
Total bill = 1439.99 + 8.2% of 1439.99
= 1439.99 + 118.08 = $ 1558.07
For Smart TV,
Selling Price = (100-10)% of 1799.99
= 90% 0f 1799.99 = $ 1619.99
Total bill = 1619.99 + 4.5% of 1619.99
= 1619.99 + 72.9 = $ 1692.89
For Iphone,
Selling Price = (100-5)% of 1699.99
= 95% 0f 1699.99 = $ 1614.99
Total bill = 1614.99 + 6.8% of 1614.99
= 1614.99 + 109.82 = $ 1724.81
For GeForce RTX 3090 Graphics Card,
Selling Price = 2199.99 - 500 = $ 1699.99
Total bill = 1699.99 + 7.5% of 1699.99
= 1699.99 + 127.5 = $ 1827.49
Total bill
Graphics Card > Iphone > Smart TV> Laptop.
Option A) Buying a laptop will be most affordable among all the options.
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Use the Distributive Property to express 64 + 24
Using the the Distributive Property to express 64 + 24 is 88.
In mathematics, what is a distributive property?This property states that multiplying the sum of two or more addends by a number produces the same result as multiplying each addend separately by the number and then adding the products together.
When you multiply a value by a sum, the distributive property of multiplication over addition is used. For instance, suppose you want to multiply 5 by the sum of 10 + 3. When we have similar terms, we usually add the numbers first and then multiply by 5. 5(10 + 3) = 5(13) = 65.
In this case, 64 + 24 will be;
= 8(8 + 3)
= 88
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a plane flying horizontally at an altitude of 2 mi and a speed of 420 mi/h passes directly over a radar station. find the rate at which the distance from the plane to the station is increasing when it has a total distance of 3 mi away from the station
The rate at which the distance from the plane to the station is increasing when it has a total distance of 3 mi away from the station is 313.05 mi/h .
Given :
a plane flying horizontally at an altitude of 2 mi and a speed of 420 mi/h passes directly over a radar station. find the rate at which the distance from the plane to the station is increasing when it has a total distance of 3 mi away from the station .
Here ,
h = 2
d = 3
we know that ,
x = [tex]\sqrt{d^2 - h^2}[/tex]
= [tex]\sqrt{3^2 - 2^2}[/tex]
= [tex]\sqrt{9 -4}[/tex]
= [tex]\sqrt{5}[/tex]
d = [tex]\sqrt{5}[/tex] * 420 / 3
= [tex]\sqrt{5}[/tex] * 140
= 313.05 mi/h
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Claire saved 205 coins that are only nickels and quarters. If her
total is $31.85 and she has $27 worth of quarters, how many
nickels does she have?
Answer: 56
Step-by-step explanation: 23+5=56
3|x + 3| = 12
A. x = 1
B. x = 1 or x = -4
C. x = 1 or x = -7
D. no solution exist
Since 3 | 1+3 | = 3 |4|
= 3·4
= 12
and
since 3 | -7+3 | = 3 |-4|
= 3·4
= 12,
both 1 and -7 check as solutions,
so C: x = 1 or x = -7
Each student wrote a two-step equation. Peter wrote the equation 5x − 4 = 16, and Andres wrote the equation 20x − 16 = 64. The teacher looked at their equations and asked them to compare them. Complete the description of one way in which the equations are similar.
To get Andres' equation, you can multiply every number in Peter's equation by what?
Answer: 4
Step-by-step explanation:
This is Peter equation 5x − 4 = 16
This is Andres equation 20x − 16 = 64
To get from Andres's equation, you multiply every number in Peter's equation by 4
5x times 4 = 20x
-4 times 4 = -16
16 times 4 = 64
If you can, please give me a Brainliest; thank you!
Answer:
4
Step-by-step explanation:
So if you look closely at the equations, you will find out that Andres equation is the same as Peter but 4 times bigger
5x-4=16
20x-16=64
20x-16=64/5x-4=16
= 4
Now let's check
4(5x-4)=4(16)
Therefore, 4 is the answer.
Andres equation is 4 times as big as Peter (but it has the same result)
Please, give me the brainliest if you can
A small cargo plane currently has 150 pounds of cargo aboard. In addition, n boxes weighing 30 pounds each will be brought aboard.
Suppose that the total weight of the cargo on board must be at most p pounds. Using the values and variables given, write an inequality describing this.
Answer: 150+30n ≤ p
Step-by-step explanation:
150 is your starting amount, and you add 30 lbs of how many ever boxes (n) onto your plane. So far, you have 150 + 30n. Because there is a limit of p amount that you can't exceed, you need a less than or equal to sign because it can be p amount but not over p amount. So your answer is 150 +30n ≤ p
which of the topics are connected together? (at least one connection)
• Absolute Value Inequalities • Linear Function • Quadratic Function • Graph Transformations • Polynomial • End Behavior • Multiplicity of a Zero • Horizontal Asymptote • Limit Notation • System of Equations • Vertical Asymptote • Rational Function • Rational Equation • Radical Function • Radical Equation • Inverse Function • Exponential Function • Logarithmic Function • Conic Sections
Answer:
Function • Quadratic Function •
Absolute Value Inequalities • Linear Function
please help! giving brainliest to best answer!
give explanation if you can
The answer to the given function -1 . f(-8) -4 . g(4) is -7.
What are functions?
The core concept of mathematics calculus is functions. The unique varieties of relations are the functions. In mathematics, a function is represented as a rule that produces a distinct result for each input x. In mathematics, a function is indicated by a mapping or transformation.
According to question, we see that f(-8)=-5, and g(4)=3
Now substituting in the given equation:
-1 . f(-8) -4 . g(4)
=(-1 . -5) - (4 . 3)
=5-12 = -7
Therefore the answer to -1 . f(-8) -4 . g(4) is -7
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Emily was checking to see if f(x) and g(x) are inverses of each other. She found that f (g(x))
(gof)(x) = +1. She concluded that f(x) and g(x) are inverses.
Was she correct? Choose the BEST answer.
- O Yes, because both f(g(x)) equals x.
O Yes, because she found f(g(x)) and g(f(x)).
O No, because f(g(x)) does not equal g(f(x)).
O No, because f(g(x)) and g(f(x)) do not both equal x.
= and
f(x) and g(x) are not inverses because f(g(x)) and g(f(x)) do not both equal x.
What is an inverse in a function?The inverse function of a function f, also known as the inverse of f, is a mathematical function that reverses the action of f. f^{-1} is used to indicate whether the inverse of f exists if and only if f is a bijective function.For a function f:X—>Y, its inverse f^{-1}:Y—>X admits an explicit description,
it sends each element y∈Y to the special element x∈X
such that, f(x)=y.
Take the real-valued function of a real variable given by f(x) = 5x 7 as an illustration.F can be compared to the function that multiplies its input by 5 before taking 7 out of the outcome. To reverse this, one multiplies the input by 7 and divides the outcome by 5.Hence, f(x) and g(x) are not inverses because f(g(x)) and g(f(x)) do not both equal x.
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The perimeter is less than 20 meters Please help I'm desperate
Answer:
Inequality is: x + 16 < 20Solution is: x < 4----------------------------------------
The perimeter is:
P = 4 + 9 + x + 3P = x + 16If the perimeter is less than 20, then the inequality is:
P < 20x + 16 < 20x < 20 - 16x < 4Answer:
x < 4
Step-by-step explanation:
The perimeter of a two-dimensional shape is the distance all the way around the outside.
Therefore, from inspection of the triangle:
⇒ Perimeter = 4 + 9 + x + 3
⇒ Perimeter = x + 16
If the perimeter is less than 20 meters then:
⇒ x + 16 < 20
Solve the inequality:
⇒ x + 16 - 16 < 20 - 16
⇒ x < 4
need the answer for my math homework
[tex]\cfrac{2}{3}-\cfrac{5}{12}\implies \cfrac{(4)2~~ - ~~(1)5}{\underset{\textit{using this LCD}}{12}}\implies \cfrac{8~~ - ~~5}{12}\implies \cfrac{3}{12}\implies \cfrac{3\cdot 1}{3\cdot 4}\implies \cfrac{1}{4} \\\\[-0.35em] ~\dotfill\\\\ \cfrac{4}{5}+\cfrac{11}{12}\implies \cfrac{(12)4~~ + ~~(5)11}{\underset{\textit{using this LCD}}{60}}\implies \cfrac{48~~ + ~~55}{60}\implies \cfrac{103}{60}\implies 1\frac{43}{60}[/tex]
If f(x)=x^2-3x-2f(x)=x
2
−3x−2, then what is the remainder when f(x)f(x) is divided by x-7x−7?
When x²-3x-2 is divided by x-7, the remainder is 26, and the quotient is x+4.
What is polynomial?Sums of terms of the form k-x^n, where k is any number and n is a positive integer, make up polynomials. For instance, the polynomial 3x+2x-5. a description of polynomials. The concepts degree, standard form, monomial, binomial, and trinomial are all covered in this video. An expression that consists of variables, constants, and exponents that is combined using mathematical operations like addition, subtraction, multiplication, and division is referred to as a polynomial (No division operation by a variable).
Here
f(x)=x²-3x-2
divisor=x-7
When x²-3x-2 is divided by x-7,
The quotient is x+4.
The remainder is 26.
The remainder will be 26 when x²-3x-2 is divided by x-7 and the quotient will be x+4.
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Janelle set a goal to walk 60 miles this month. She walks at a consistent rate of 4 miles per hour.
Write an equation that shows how the number of miles Janelle has left to walk, y, depends on the number of hours she has already walked, x.
Answer:
[tex]60=4x\\\\15=x[/tex]
I hope this helped.
Answer: y = -4x+60
y is -4 times x plus 60
HELP ME PLEASE ASAP!! it’s for algebra 1 and you have to create an equation in standard form using the information in the picture. literally anyone help please i am begging i really need this done
Answer:
7x - y = 5
Step-by-step explanation:
(y - y1) = m(x - x1)
Here, (x1, y1) = (1, 2) and m = 7
(y - 2) = 7(x - 1)
y - 2 = 7x - 7
7x - y - 7 = - 2
7x - y = -2 + 7
7x - y = 5
Answer:The standard form of the equation of the line through the given point with the given slope through:(1, 2), slope = 7 is 7x - y = 5.
Step-by-step explanation:
A ladder is leaning against a building so that the top of the ladder is touching the roof line. the bottom of the ladder is 7 feet from the building and the ladder is 25 feet long. how far is the roof line from the ground?
Using the Pythagorean theorem, we know that the roof of the building is 24 ft far from the ground.
What is the Pythagorean theorem?The Pythagorean theorem, sometimes known as Pythagoras' theorem, is a basic relationship between a right triangle's three sides in Euclidean geometry.
According to this statement, the areas of the squares on the other two sides add up to the size of the square whose side is the hypotenuse.
So, the Pythagorean theorem formula:
c² = a² + b²
Now, substitute the values in the formula to calculate the distance between the roofline and the ground.
c² = a² + b²
25² = a² + 7²
625 = a² + 49
a² = 625 - 49
a² = 576
a = √576
a = 24ft
Therefore, using the Pythagorean theorem, we know that the roof of the building is 24 ft far from the ground.
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a church has 7 bells in its bell tower. before each church service 3 bells are rung in sequence. no bell is rung more than once. how many sequences are there?
There are 210 sequences for 7 church bells to rung with the given conditions. Using permutations, the required number of sequences is calculated.
What are permutations?A sequence or arrangement that can be framed by taking some or all of a finite set of things (or objects) is called a permutation.
The formula for finding the number of such arrangements is,
ⁿPₓ = n!/(n - x)!
Calculation:It is given that, a church's bell tower has 7 bells. 3 of them will ring in a sequence before each service and no bell is rung more than once.
So, the number of sequences that the bells will form is calculated by using the permutations formula. I.e., ⁿPₓ = n!/(n - x)!
Here, n = 7; x = 3
Then,
ⁿPₓ = n!/(n - x)! ⇒ ⁷P₃ = 7!/(7 - 3)! = 7!/4!
⇒ ⁷P₃ = (7 × 6 × 5 × 4!)/4! = 7 × 6 × 5 = 210
Therefore, there are 210 sequences for ringing the bells.
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PLEASE HELP ASAP!!!!!!!
Problem #4
A. Draw a scaled copy of the circle using a scale factor of 2.
B. How does the circumference of the scales copy compare to the circumference of the original circle?
C. How does the area of the scaled copy compare to the area of the original circle?
(I don’t need to do 5)
The circumference of the scaled circle is half the circumference of the original circle and the area of the scaled circle is half the area of the original circle.
What is the scale factor?
The ratio of the scale of an original thing to a new object that is a representation of it but of a different size is known as a scale factor (bigger or smaller).
For instance, we can increase the size of a rectangle with sides of 2 cm and 4 cm by multiplying each side by, let's say, 2. The new figure we receive will resemble the first figure, but every dimension will be double that of the first rectangle. The scale factor in this case will be denoted by the number 2.
Let us take the radius of the circle to be r
We know that circumference = 2πr and the area of a circle is πr²
As, Scale factor = Original circle / Scaled circle
From the question, scale factor = 2
Thus,
2 = Circumference of the Original circle / Circumference of the Scaled circle.
⇒ Circumference of the Scaled circle = (1/2) * Circumference of the Original circle
For the area as well, scale factor = 2
2 = Area of the Original circle / Area of the Scaled circle
⇒ Area of the scaled circle = (1/2) * Area of the original circle
Thus,
The circumference of the scaled circle is half the circumference of the original circle and the area of the scaled circle is half the area of the original circle.
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The circumference of the scaled circle is half the circumference of the original circle and the area of the scaled circle is half the area of the original circle.
What is the scale factor?
The ratio of the scale of an original thing to a new object that is a representation of it but of a different size is known as a scale factor (bigger or smaller).
For instance, we can increase the size of a rectangle with sides of 2 cm and 4 cm by multiplying each side by, let's say, 2. The new figure we receive will resemble the first figure, but every dimension will be double that of the first rectangle. The scale factor in this case will be denoted by the number 2.
Let us take the radius of the circle to be r
We know that circumference = 2πr and the area of a circle is πr²
As, Scale factor = Original circle / Scaled circle
From the question, scale factor = 2
Thus,
2 = Circumference of the Original circle / Circumference of the Scaled circle.
⇒ Circumference of the Scaled circle = (1/2) * Circumference of the Original circle
For the area as well, scale factor = 2
2 = Area of the Original circle / Area of the Scaled circle
⇒ Area of the scaled circle = (1/2) * Area of the original circle
Thus,
The circumference of the scaled circle is half the circumference of the original circle and the area of the scaled circle is half the area of the original circle.
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In circle R with m ∠ Q R S = 134 m∠QRS=134 and Q R = 6 QR=6 units find area of sector QRS. Round to the nearest hundredth.
Answer:
142.10 units²
Step-by-step explanation:
[tex] A = \dfrac{n}{360^\circ}\pi r^2 [/tex]
[tex] A = \dfrac{134^\circ}{360^\circ}\pi \times 6^2 [/tex]
[tex] A = \dfrac{134^\circ}{360^\circ}\pi \times 6^2 [/tex]
[tex] A = 142.10~units^2 [/tex]
stat 100 tto test the null hypothesis that there's no difference in parents' wealth for the different levels of schooling, what significance test should we use?
To test the null hypothesis that there is no difference in parents' wealth for the different levels of schooling, a one-way ANOVA (analysis of variance) test should be used.
What is ANOVA test?To compare the means of two or more groups, statisticians employ the analysis of variance (ANOVA) test. It is used to assess whether there are any significant variations in the means of the groups and to pinpoint which group or groups have significantly different means. The null hypothesis, according to which there is no difference between the group means, is evaluated using the ANOVA test using the F-statistic. If the F-statistic is significant, at least one of the groups has a mean that differs from the others in a meaningful way. To examine how several treatments or circumstances affect a response variable, investigations frequently utilize an ANOVA. It can also be used in non-experimental research to compare the means of different groups.
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Literal Equations
help asap !!
Answer:
Step-by-step explanation:
P = F/a
Pa = F
a = F/P
Answer:
a = [tex]\frac{F}{p}[/tex]
Step-by-step explanation:
P =[tex]\frac{F}{a}[/tex] multiple both sides by a
aP = [tex]\frac{F}{a}[/tex] [tex]\frac{a}{1}[/tex] On the right side of the equal sign, the a's cancel each other out
aP = F Divide both sides by P
[tex]\frac{aP}{P}[/tex] = [tex]\frac{F}{P}[/tex] The P's cancel out on the left side of the equal sign.
a = [tex]\frac{F}{P}[/tex]
2. Solve the system by substitution or elimination.
4x + y = 1
3y = -6x + 27
Answer:
(2, -7)
Step-by-step explanation:
4x + y = 1 3y= 6x + 27
y = 1 - 4x
3(1 - 4x) = 6x + 27
3 - 12x = 6x + 27
-12x = 6x + 24
-18x = 24
6/3
2
y = 1 - 4x
y = 1 - 4(2)
y = 1 - 8
y = -7
4x + y = 1
Answer:
Step-by-step explanation:
4x + y = 1
Divide 4x by 4, then do the same to the 1
4x/4 + y = 1/4
= x + y = 0.25
If you are solving for x, then the equation will look like this.
x = 0.25 - y (minus because you are moving the variable to the other side of the = sign)
If you are solving for y, then the equation will look like this.
y = 0.25 - x (minus because you are moving the variable on the other side of the = sign)
Answer solving for x = x = 0.25 - y
Answer solving for y = y = 0.25 - x
-------------------------------------------------------------------------------------------------------------
3y = -6x + 27
3y/3 = -6x + 27/3
y = -6x + 9
Bring -6x to the other side of the =.
6x + x = 9
6x/6 + y = 9/6
x + y = 1.5
Then you have to move the variable depending on which one you are going to solve for.
Answer solving for x = 1.5 - y
Answer solving for y = 1.5 - x
Hope this helps!
Please answer! Thank youuu
Answer:
36%
Step-by-step explanation:
People with size 7 shoes = 5
People with size 7½ = 7
People with size 8 = 9
People with size 8½ = 3
People with size 9 = 1
To find out the total, you have to add all the people up:
5 + 7 + 9 + 3 + 1 = 25
The total amount of students = 25
Since you're trying to find the percentage of students who have a shoe size of 8, you have to look at how many people have that size:
People with size 8 = 9
To find out the percentage you do:
9/25 × 100 = 36%
Therefore 36% of students have a shoe size of 8
:)
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