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 $l=7.5$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 1, Equations and Inequalities - 1.5 Use Problem Solving Strategies and Models - 1.5 Exercises - Skill Practice - Page 37: 10
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