Answer
See below.
Work Step by Step
$A=0.5h(a+b)\\a+b=\frac{2A}{h}\\b=\frac{2A}{h}-a$
This gives the base of the trapezoid with respect to the area, the height and the other base of it.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 6 - Algebra: Equations and Inequalities - 6.3 Applications of Linear Equations - Exercise Set 6.3 - Page 375: 54
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