#### Answer

$l=\frac{15}{2}$, or $l=7.5$

#### Work Step by Step

Given: Perimeter formula is $P=2l+2w$, $P=25$ centimeters, $w=5$ centimeters, and $l$ is unknown.
$P=2l+2w$
$25=(2l)+(2\times5)=2l+10$
$15=2l$
$l=\frac{15}{2}$, or $l=7.5$

Published by
McDougal Littell

ISBN 10:
0618595414

ISBN 13:
978-0-61859-541-9

$l=\frac{15}{2}$, or $l=7.5$

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