#### Answer

$4$

#### Work Step by Step

Note that $16=4^2$.
Thus, the given expression is equivalent to:
$\sqrt{4^2}$
RECALL:
For $a \ge0$, $\sqrt{a^2}=a$.
Using the rule above gives:
$\sqrt{4^2} = 4$

Published by
Brooks Cole

ISBN 10:
0-53449-636-9

ISBN 13:
978-0-53449-636-4

$4$

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