#### Answer

$9$

#### Work Step by Step

Using concepts of exponents and radicals, the given expression, $
\sqrt{81}
,$ is equivalent to
\begin{array}{l}\require{cancel}
\sqrt{(9)^2}
\\\\=
9
.\end{array}

Published by
Pearson

ISBN 10:
0-32184-874-8

ISBN 13:
978-0-32184-874-1

$9$

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