Answer
$-21$
Work Step by Step
$-7\times3$ is the same as $7\times3$ but simply take the opposite. Since $7+7+7=21$, you know $7\times3$ is 21, so change it to $-21$
Prealgebra (7th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321955048
ISBN 13:
978-0-32195-504-3
Chapter 2 - Cumulative Review - Page 161: 45
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