#### Answer

$0.9$

#### Work Step by Step

Recall, square roots cancel out exponents of two. Thus, we obtain:
$\sqrt{.81}\\\\=\sqrt{0.9^2}
\\=0.9$

Published by
Pearson

ISBN 10:
0-13417-894-7

ISBN 13:
978-0-13417-894-3

$0.9$

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