SOLUTION: A rectangle has a length of 15 cm and a perimeter of 72 cm. Which equation could be used to find the width of the rectangle?

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Question 700053: A rectangle has a length of 15 cm and a perimeter of 72 cm.

Which equation could be used to find the width of the rectangle?

Answer by Stitch(470) About Me  (Show Source):
You can put this solution on YOUR website!
The equation for the perimeter of a rectangle is : P = 2L + 2W
You can rewrite that equation to solve for W
P+=+2L+%2B+2W
Subtract 2L from both sides
P+-+2L+=+2W
Divide both sides by 2
%28P+-+2L%29%2F2+=+W
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Now all you have to do is plug in your given values.
72+-+2%2A%2815%29%29%2F2+=+W
%2872+-+30%29%2F2+=+W
42+%2F+2+=+W
21+=+W