Answer
-80
Work Step by Step
-40 -40
Change subtraction to addition
Positive 40 is changed to its opposite (-40)
-40 +(-40) = -80
Basic College Mathematics (10th Edition)
by Lial, Margaret L.; Salzman, Stanley A.; Hestwood, Diana L.
Published by
Pearson
ISBN 10:
0134467795
ISBN 13:
978-0-13446-779-5
Chapter 9 - Basic Algebra - Summary Exercises - Operations with Signed Numbers - Page 656: 13
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