Answer
$-30$
Work Step by Step
In adding two numbers with the same sign, perform the following steps:
(1) Add their absolute values.
$|-15| + |-15| = 15 + 15 = 30$
(2) The sum must have sign common to the addends.
$-15+(-15) = -30$
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: 14
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