#### Answer

9

#### Work Step by Step

The opposite of a number is one in which their sum equals 0.
-9 + 9 = 0, so 9 is the opposite of -9.

Published by
Pearson

ISBN 10:
0321726391

ISBN 13:
978-0-32172-639-1

9

The opposite of a number is one in which their sum equals 0.
-9 + 9 = 0, so 9 is the opposite of -9.

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