Answer
See below.
Work Step by Step
$A=0.5bh\\b=\frac{2A}{h}$
Thus plugging in $A=9,h=3$: $b=\frac{2(9)}{3}=6$
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 - 1.4 Rewrite Formulas and Equations - Guided Practice for Example 2 - Page 27: 6
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