College Algebra 7th Edition

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: 39

Answer

$120$ feet.

Work Step by Step

The entire area of the plot is equal to the area of the building added to the area of the parking lot, or $(60)(40)+12,000$, or $14,400$ square feet. Since the plot is square, the side length is $\sqrt {14,400}=120$ feet.
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