Introductory Algebra for College Students (7th Edition)

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 65: 106


$$-8 + (-13) = -21$$

Work Step by Step

In this problem, we are adding a $-13$ to an already negative number, $-8$, meaning that we are already on the negative side of the number line and we are going more left on the number line. If we are at $-8$ on the number line and go left $13$ spots, then we will be at $-21$. Therefore, $$-8 + (-13) = -21$$
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