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AfilCa [17]
3 years ago
10

The width w of a rectangular swimming pool is 7 * 2. The area A of the pool is 7x^3 – 42x^2. What is an expression for the lengt

h of the pool? Show your work.Please show your work.
Mathematics
1 answer:
blsea [12.9K]3 years ago
4 0
I suspect the width is 7x^2 (please double-check).
If that's the case,
the length of the pool is
L=(7x^3-42x^2)/(7x^2)
=7x^3/(7x^2)-42x^2/(7x^2)
=x-6

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<h3>Answer: Choice B) 122%</h3>

==========================================

Work Shown:

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The formula to use is

C = [ (B-A)/A ] * 100

to calculate the percent change.

Basically we calculate the change (B-A) first and then divide that over the original amount A to compute the decimal form of the answer, which is then converted over to percentage form. The "100" tacked on at the end is what converts from decimal to percent form.

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