Answer
$w=20$
Work Step by Step
Given Information: perimeter formula is $P=2l+2w$. $P=100$ meters, $l=30$ meters, and $w$ is unknown.
$P=2l+2w$
When we substitute in the values for $P$ and $l$:
$100=(2\times30)+(2w)=60+2w$
$40=2w$
$w=20$
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: 9
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