Elementary Algebra

Published by Cengage Learning
ISBN 10: 1285194055
ISBN 13: 978-1-28519-405-9

Chapter 1 - Some Basic Concepts of Arithmetic and Algebra - 1.3 - Integers: Addition and Subtraction - Problem Set 1.3: 82

Answer

$20$

Work Step by Step

Written horizontally, this problem reads $13-(-7)$ Subtracting a negative number is the same thing as adding a positive number. We rewrite the expression as $13+7$ We perform the addition to get $20$
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