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astraxan [27]
3 years ago
15

Mary is traveling cross country on a road trip. So far, Mary has traveled 200 miles in her car and 200 miles by train. The car t

raveled at a
rate that was 30 miles per hour slower than the train.
Mary modeled the total time for her trip with the following expression.
200 + 20030
What does x - 30 represent in this situation?
Mathematics
2 answers:
Scilla [17]3 years ago
7 0

Answer:

x-30 is the equation used to determine the car's speed in mph.

Step-by-step explanation:

VikaD [51]3 years ago
5 0

Answer:

i dont know i think it is 11?!? srry if im wrong

Step-by-step explanation:

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25 is what percent of 20?
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Answer:

20 is 80% of 25

Step-by-step explanation:

We assume, that the number 25 is 100% - because it's the output value of the task.

2. We assume, that x is the value we are looking for.

3. If 100% equals 25, so we can write it down as 100%=25.

4. We know, that x% equals 20 of the output value, so we can write it down as x%=20.

5. Now we have two simple equations:

1) 100%=25

2) x%=20

where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

100%/x%=25/20

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for 20 is what percent of 25

100%/x%=25/20

(100/x)*x=(25/20)*x       - we multiply both sides of the equation by x

100=1.25*x       - we divide both sides of the equation by (1.25) to get x

100/1.25=x

80=x

x=80

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Step-by-step explanation:

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By solving for x, use the Quadratic Formula.

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