Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 6 - Section 6.7 - Variation and Problem Solving - Exercise Set - Page 399: 59

Answer

9

Work Step by Step

We know that $\sqrt 81=9$, because $9^{2}=9\times9=81$.
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