Basic College Mathematics (9th Edition)

Published by Pearson
ISBN 10: 0321825535
ISBN 13: 978-0-32182-553-7

Chapter 9 - Basic Algebra - Summary Exercises - Operations with Signed Numbers: 13



Work Step by Step

-40 -40 Change subtraction to addition Positive 40 is changed to its opposite (-40) -40 +(-40) = -80
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