#### Answer

$9$

#### Work Step by Step

$\sqrt {81}=\sqrt {9^{2}}=(9^{2})^{\frac{1}{2}}=9$

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

$9$

$\sqrt {81}=\sqrt {9^{2}}=(9^{2})^{\frac{1}{2}}=9$

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