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OpenStudy (math_bender_15):
The length of a rectangle is twice its width. If the perimeter of the rectangle is 42 , find its area.
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OpenStudy (shane_b):
\[L=2W\]\[P=2L+2W\]Substitute 2W for L:\[P=2W+2W=4W=42\]Solve for W...and L will be 2x W.
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