Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 10 - Radical Expressions and Equations - Pull it All Together - Page 640: Task 3


about 55.56 feet squared

Work Step by Step

The given formula is $d=1.2\sqrt A$. We need to isolate $A$ in order to solve for it: Divide by 1.2 on both sides and then square each side: $(\frac{d}{1.2})^{2}=A$ Now, plug in 8 for $d$ and then repeat for $12$: $(\frac{8}{1.2})^{2}=44.44$ and $(\frac{12}{1.2})^{2}=100$ Subtract the area when $d=12$ by the area when $d=8$: $100-44.44=55.56$
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