Basic College Mathematics (10th Edition)

Published by Pearson
ISBN 10: 0134467795
ISBN 13: 978-0-13446-779-5

Chapter 9 - Basic Algebra - 9.2 Adding and Subtracting Signed Numbers - 9.2 Exercises - Page 638: 16



Work Step by Step

To add $9+(-10)$, we can take the absolute value of both numbers. $|9|=9$ $|-10|=10$ Next, we can subtract the lesser absolute value from the greater absolute value. $10-9=1$ The number with the greater absolute value is negative, so the result will be negative. Therefore, $9+(-10)=-1$.
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