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A rectangle's length is three times its width.  Let w denote the rectangle's width.  What polynomial represents the rectangle's area? 

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AL2006id
Width = ' W '
Length = 3 times as long = 3W

Area = (length) x (width) = (3W) x (W) = 3W²
Tadvisohil886id
Width = W
Length = 3W

Area = Length * Breadth

= 3W * W

= 3W²

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