#### Answer

$-85$

#### Work Step by Step

Using order of operations, the given expression, $
-8(\sqrt{64})-(-3)(-7)
,$ simplifies to
\begin{array}{l}\require{cancel}
-8(\sqrt{(8)^2})-(21)
\\\\=
-8\cdot8-21
\\\\=
-64-21
\\\\=
-85
.\end{array}

Published by
Pearson

ISBN 10:
0321969359

ISBN 13:
978-0-32196-935-4

$-85$

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