Answer
y=$4\sqrt 5$ feet.
Work Step by Step
The equation for the area of this figure is $(\frac{y\times y}{2})+(y\times y) = 120$.
Solving for $y$ yields $y=\sqrt {(\frac{2}{3}) \times 120}=\sqrt {80}=4\sqrt 5$ feet.
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305115546
ISBN 13:
978-1-30511-554-5
Chapter P, Prerequisites - Section P.9 - Modeling with Equations - P.9 Exercises - Page 71: 41
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