Posted by Louis on Monday, December 3, 2007 at 9:29pm.
The formula for finding the area of a rectangle is:
A = 2h + 2w
You know the area and the width. Solve the equation for the height. If you post your answer, we'll be glad to check it.
The area of a rectangle is (length)(width)
so 86.4 = 12(length)
length = 86.4/12
Check your answer by multiplying what you got by 12
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