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Q: If the perimeter of a rectangle is 72 and we know that the length is 8 cm less than twice the width, which of the following best represents the formula we will use to find the length and width?
A: Solution: l = length w = width Start with what you know and form equations. [ The perimeter is the distance of all sides added..length + length + width + width is equal to the perimeter or 2(length) + 2 (width) = perimeter So: you could say 2l + 2w = 72 then you know that the length is 8 less then twice the width. l = 2w - 8..now that we have 2 equations we can find the solutions. Since we
know that l = 2w - 8 we can substite l from this equation into the other one. 2(2w - 8) + 2w = 72 4w - 16 + 2w = 72 (answer) ]
bongche|Points 3406|
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Asked 10/27/2012 1:32:02 PM
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