Answer
$0$
Work Step by Step
RECALL:
The Inverse Property of Addition states that for any real number $a$,
$a + (-a) = 0$
Use the property above where $a=15$ to have:
$15 + (-15)=0$
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 1 - Section 1.5 - Addition of Real Numbers - Exercise Set - Page 63: 12
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