Answer
-20
Work Step by Step
To subtract a number, add its opposite number.
$-13-7=-13+(-7)$
To add negative numbers, add their absolute values and make the result negative.
$-13+(-7)=-(|-13|+|-7|)=-(13+7)=-20$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 1 - Foundations for Algebra - 1-5 Adding and Subtracting Real Numbers - Practice and Problem-Solving Exercises - Page 34: 31
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