Algebra 2 (1st Edition)

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


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