Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 1 - Foundations for Algebra - Chapter Review - Page 71: 64

Answer

3

Work Step by Step

A key rule to remember is that subtracting a negative is the same as addition. Thus, we obtain: $-9-(-12)=-9+12=3$
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