Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 5 - Number Theory and the Real Number System - 5.2 The Integers; Order of Operations - Exercise Set 5.2 - Page 271: 138

Answer

See below.

Work Step by Step

We have 2 cases: if they have the same signs, then we add their absolute values and put the common sign in front of the sum of the absolute values. If they have different signs, then we add their absolute values and put the sign of the number with the larger in front of the sum of the absolute values.
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