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lara [203]
3 years ago
5

Sally fills her car with 12 gallons of gas. She goes on a journey and ends up with 7.5 gallons left in the tank. What is the per

cent of change?
Mathematics
1 answer:
melomori [17]3 years ago
5 0
Around 80-75 percent.
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A psychologist collects data on the time, w, in minutes, people walk each day and their scores, t ,on a stress test. The scores
faust18 [17]

Answer: D: The model predicts that a person who does not walk each day will score about 48.1 on the test.


Step-by-step explanation:

Given: A psychologist collects data on the time, w, in minutes, people walk each day and their scores, t ,on a stress test.

She finds that there is a negative linear association between w and t that is best modeled by the equation t=-2.5w+48.1 .

When we put w=0 minutes, t=48.1

It implies that if any patient doesn't walk will score 48.1.

Hence, the model predicts that a person who does not walk each day will score about 48.1 on the test.

8 0
3 years ago
Read 2 more answers
Working together, Jimmy and Adam can sweep a porch in 4.44 minutes. Had he done it alone it would have taken Adam eight minutes.
Hitman42 [59]

Answer:

3.16 minutes

Step-by-step explanation:

6 0
3 years ago
If A={1,2,3,4,5},B={4,5,6,7} and C={2,3,4}find (A-B)-C​
Oksana_A [137]

Answer:

(A - B) - C = { 1 , 4 , 6 , 7 }

Step-by-step explanation:

A = { 1 , 2 , 3 , 4 , 5 }

B = { 4 , 5 , 6 , 7 }

A - B = { 1 , 2, 3 ,6 , 7 }

C = { 2 , 3 , 4 }

(A - B) - C = { 1 , 4 , 6 , 7 }

4 0
3 years ago
A tortoise makes a journey in two parts; it can either walk at 4cm/s or crawl at 3cm/s. If the tottoise walks the first part and
Ugo [173]

Answer:

120

240

Step-by-step explanation:

We call the length of first part x

Length of second part = y

In the first scenario, it took the tortoise 110 sec to walk the first part and crawl the second.

So,

We have this equation,

x/4 + y/3 = 110

We take the LCM

(3x + 4y)/12 = 110

When we cross multiply

3x + 4y = 110x12

3x + 4y = 1320 ----- equation 1

For scenario 2

x/3 + y/4 = 100

When we take the LCM

(4x + 3y)/12 = 100

We cross multiply

4x + 3y = 100x12

4x + 3y = 1200 ------ equation 2

We now have two equations and we will solve for x and y using simultaneous linear equation.

3x + 4y = 1320 ----- 1

4x + 3y = 1200 ----- 2

We subtract equation 2 from 1 to get

- x + y = 120

We make y subject

y = x + 120 ----- 3

We put the value of y in equation 3 into equation 1

3x + 4(x + 120) = 1320

3x + 4x + 480 = 1320

7x + 480 = 1320

7x = 1320-480

7x = 840

We divide through by 7

x = 840/7

x = 120

We put value of x in equation 3

y = x + 120

y = 120 + 120

y = 240

120 and 240 are the lengths of the 2 parts of the journey.

Thanks

5 0
3 years ago
Jonathan bought 6 cans of paint and 2/3 of a pint of special paint additive formulated to reduce mildew. Before painting his hou
gayaneshka [121]

Answer:

1/9 pint

or 2/9 cup

Step-by-step explanation:

This question is asking us to <em>divide </em>2/3 pint among 6 cans.

2/3 ÷ 6

2/3 × 1/6

 = 2/18

 = 1/9 pint or 2/9 cup additive

5 0
3 years ago
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