Answer
$9$
Work Step by Step
To find the multiples of $81$. In order to this recall the square root property.
Thus, $81=\sqrt{ 3\cdot 3\cdot 3\cdot 3}=3 \cdot 3=9$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 7 - Review Exercises - Page 576: 1
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