basic geometry

could someone check my work.
The width of a rectagular is one -half the length. the perimeter of the rectangler is 72 inches Find the length of the picture
2L+2w=72
2L(1/2)+2w=72
2L(5)+2w=72
10L+2w=72
12=72
L=12/72
L=6

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asked by vero

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