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 64: 89

Answer

makes sense

Work Step by Step

Thinking of temperatures above and below zero is similar to the concept of the number line. So a temperature of $13$ below zero can be thought of as $-13^\circ.$ Adding $4$ is similar to raising the temperature by $4^\circ.$ The new temperature is $9^\circ$ below zero, or $-13+4=-9.$
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