Answer
$99$
Work Step by Step
The two factors have the same signs, so their product is positive
Thus,
$(-9)(-11) = 99$
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 5 - Number Theory and the Real Number System - Chapter Summary, Review, and Test - Review Exercises - Page 335: 20
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