Mathematics Middle School

If y varies directly with x, and y = 2 when x = −4, what is the value of y when x = 20 ?

Answers

Answer 1

Answer:

y=kx

2=k.-4

k=-1/2

then

y=-1/2×20

y=-10

Answer 2

Answer:

y = - 10

Step-by-step explanation:

Given that y varies directly with x then the equation relating them is

y = kx ← k is the constant of variation

To find k use the condition y = 2 when x = - 4, that is

2 = - 4k ( divide both sides by - 4 )

[tex]\frac{2}{-4}[/tex] = k, that is

k = - [tex]\frac{1}{2}[/tex]

y = - [tex]\frac{1}{2}[/tex] x ← equation of variation

When x = 20, then

y = - [tex]\frac{1}{2}[/tex] × 20 = - 10

Related Questions

Somebody help please

Answers

Answer:

ur question is just somebody help please not a real math problem

Step-by-step explanation:

I'll try to help if I know it but still

Where’s the question?

Please help me with this

Answers

Answer:

33 lol

Step-by-step explanation:

y=77 toy cars
here’s the work⬇️

NEED IT NOW

8a ⬇ image

8b Explain why that is the correct answer, and the other is incorrect.

Answers

Answer:

Mia is correct.

Step-by-step explanation:

You can see this if you write 5/11 in a calculator, you get 0.454545454545 infinitely. In other cases, you would write it like Malik said if the answer were to be 0.455555555, but it isn't.

Answer:

Mia

Step-by-step explanation:

50 points for brainless and only if u get the answers CORRECT.

Answers

For number 12 you will be able to get 7 pictures sry I didn’t really understand the question
You will be able to get 7 pictures

Jill wants to make melonade for her family reunion. She needs enough lemonade for 60 people to each have 1 cup. How many gallons of lemonade does Jill need to make?

Answers

Answer:

4 or 3.75

Step-by-step explanation:

there are 16 cups in a gallon

60/16 is 3.75

if you want you can round up

but to have an even amount it would be 4

Answer:

3.75 gallons

Step-by-step explanation:

1 cup = 0.0625

10 = 0.625

30=0.625

60 = ur answer (3.75)

The mass of one coin is 16.718 grams. The mass of a second coin is 27.22 grams. How much greater is the mass of the second coin than the first? Show your reasoning.

Answers

Answer:

10.502

Step-by-step explanation:

help meeeeeee number 4

Answers

Answer:

what is it I can't see number 4

Step-by-step explanation:

The answer to this question is A

The two triangles below are similar. What is
the missing length?
A. 21
B. 22
C. 24
D. 26

Answers

Answer:b

Step-by-step explanation:

16+8=24 14+8=22 the triangles are similar so what one side does so does the other.

The missing length in the two similar triangles is C) 24.

The answer is C: 24.

The two triangles are similar, which means that all corresponding side lengths are proportional. In other words, the ratio of any two corresponding side lengths in the two triangles will be the same.

The two longest sides in the two triangles are 26 and x, respectively. Since these are corresponding side lengths, we know that the ratio of these two side lengths is equal to the ratio of any other two corresponding side lengths. Therefore, we have:

26 / x = 12 / 9

Solving for x, we get:

x = 26 * 9 / 12 = 24

Therefore, the missing length is 24.

To learn more about length here:

https://brainly.com/question/32060888

#SPJ2

1.y = mx is a _____________ variation
2.In the equation y = mx, m represents the _______

Answers

Answer:

Slope

Step-by-step explanation:

In the equation y = mx + b for a straight line, the number m is called the slope of the line. Definition 2. In the equation y = mx + b for a straight line, the. number b is called the y-intercept of the line.

Answer: the first one is direct and the second one is rate

Step-by-step explanation:

187=18-w

solve for w

Answers

Answer:

w=169

Step-by-step explanation:

subtract 187 by 18

Answer: 169

Step-by-step explanation:

187 minus 18 equals 169 which is w

Complete the equivalent ratio table.

Answers

Answer:

10, 45, 63

Step-by-step explanation:

it should be 10 45 63 my guy

HELP ASAP
WILL GIVE BRAINLY

Answers

Answer:

7, 80, and 6

Step-by-step explanation:

i think...

Tyler’s grocery receipt shows a charge of $0.25 for every apple he purchased.

Let g represent the amount on the grocery receipt.
Let a represent the number of apples purchased.

Which is the dependent variable?
the amount of the grocery bill
the cost of an apple
the weight of the apples
the number of apples purchased

Answers

Answer:

The REAL answer is A

Step-by-step explanation:

took the test on edge

Answer:

Its a i think.

Step-by-step explanation:

Use complete sentences to describe why Set A = {x|x is an even whole number between 0 and 2} = ∅.

giving brainliest to the one who answers the best

Answers

Answer:

*1 month later*

Step-by-step explanation:

Match each expression with the equivalent expanded expression.

Answers

1-1
2-3
3-5
4-2
5-4




Isjdjsh
I got the same thing

1-1
2-3
3-5
4-2
5-4

Write the equation of the line that is perpendicular to y=1/4x+3 and passes through the point (-2, 7). BRANLIEST=Quickest PLEASE HELP ASAP

Answers

Answer:

What line is perpendicular to the line 2x + 3y = 6 through (4, 1)? Explanation: The given equation is in standard form, so it must be converted to slope-intercept form: y = mx + b to discover the slope is –2/3. To be perpendicular the new slope must be 3/2 (opposite reciprocal of the old slope).

Step-by-step explanation:

Answer:

What line is perpendicular to the line 2x + 3y = 6 through (4, 1)? Explanation: The given equation is in standard form, so it must be converted to slope-intercept form: y = mx + b to discover the slope is –2/3. To be perpendicular the new slope must be 3/2 (opposite reciprocal of the old slope)

Step-by-step explanation:

I will write to explain how to find the rate from the problem provided and write in d=rt.

A dolphin can travel 30 kilometers every two hours. Determine the constant rate of change that the dolphin travels and write in d=rt form.

Answers

Rate of change is 15
Rate of change per hour is 15 but per 2 hour is 30 although your form is not a form I know so if you can find the forms name I can put it in form

slope and y-intercept from graphs, I don't know if I am right and I don't know how to finish it even tho I have noted, can someone help me, can someone please answer this question, thank you!

Answers

Answer:

I think 5 is right and the slope is either -1/2 or -2/1

I think 5 is right and slope is -1/2

Order each set of values from Least to Greatest Here is both Sets.
0.4 1/2
5/8 0.55
38% 5/7

Answers

Answer:

1.)

2.)

3._

Step-by-step explanation:

I need help with this one.... i really don't understand it

Answers

Answer:

Step-by-step explanation:

I believe it is F!
I’m pretty sure the and Is A

Plz answer quickly
-3 = z - 8

Answers

Answer:

5

Step-by-step explanation:

z = -3 + 8 = 5

Answer:

z = 5

Step-by-step explanation:

-3 = z - 8

Isolate z.

-3 + 8 = z

Simplify.

z = 5

PLEASE ANSWER QUICK One year, the population of a city was 164,000. Several years later it was 182,040. Find the percent increase.

Answers

Answer:

There was an 11% increase.

Step-by-step explanation:

The formula to find a percent increase is this: (original amount - new amount / original amount) * 100

If you fill in the formula, you get this:

(164,000 - 182,040 / 164,000) * 100

Solve:

(-18,040 / 164,000) * 100 ---> If the number being divided is negative, find the absolute value.

(18,040 / 164,000) * 100 =

0.11 * 100

11%

Today is the 65th day of school. If we are out of 180 days, how do I write this as a
fraction in simplest forms

Answers

13/36 would be the answer I believe

i would be great if you could explain it!!!

Answers

Multiply 8.4 x 10.9 x 8.4 x 10.9 .. sorry if I’m wrong

Which method correctly solves the equation using the distributive property?

Negative 0.2 (x minus 4) = negative 1.7
Negative 0.2 (x minus 4) = negative 1.7. Negative 0.2 x minus 4 = negative 1.7. Negative 0.2 x = 2.3. x = negative 11.5.
Negative 0.2 (x minus 4) = negative 1.7. x minus 4 = 0.34. x = 4.34.
Negative 0.2 (x minus 4) = negative 1.7. Negative 0.2 x + 0.8 = negative 1.7. Negative 0.2 x = negative 2.5. x = 12.5.
Negative 0.2 (x minus 4) = negative 1.7. Negative 0.2 x minus 0.8 = negative 1.7. Negative 0.2 x = negative 0.9. x = 4.5.


A,B,C,D

Answers

Answer:

i believe the correct answer is b

A counter recorded 254 revolutions of the bicycle wheel shown below how far did the bicycle travel. Use 22/7 as pi and the diameter of the wheel is 5/4.''



''a) how far does the wheel roll for one tire revolution''
''b) what is the total distance recorded''
Show your work

Answers

Answer:

Step-by-step explanation:

Answer:

Step-by-step explanation:

I am doing rate of change, question is down below.
I have two questions.Both down below.

Answers

Answer:

For the first question, the answer is 4/3. For the second it is 16.

Step-by-step explanation:

I just took the quiz! Can I please have Brainliest? Hope this helped!

For the first is 4/3 and the second I don’t know sorry

The value of y varies directly with x, when y = 5 and x = 6. What is the equation for this relationship? What is the value of y when x = 42?

Answers

Answer:

y is 35

Step-by-step explanation:

...................

Answer:

y = 35

Step-by-step explanation:

42 divided by 6 equals 7 and 7 x 5 is 35

someone help your sister out!!!!!you don't have to answer it all, even one can helppp thank you!!!
1.Sandra has $60 in a savings account. The interest rate is 5%, compounded annually.
To the nearest cent, how much interest will she earn in 2 years?

2. Ernesto has $70 in a savings account that earns 10% interest, compounded annually.To the nearest cent, how much will he have in 2 years?

3.Emmet deposited $90 in a savings account earning 10% interest, compounded annually.To the nearest cent, how much interest will he earn in 3 years?

Answers

SCHOOL IS HELL OF A HELL
I solved it on paper hope it helps

1000 jumps for 3 hours
________ per hour

Answers

Answer:

333.33333333

Step-by-step explanation:

it wouldn't be a whole number

Answer:

333.3  (3 repeats forever)

Step-by-step explanation:

To find the answer all you have to do is

divide 1000 by 3

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