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 - 1-5 Adding and Subtracting Real Numbers - Practice and Problem-Solving Exercises: 20

Answer

3

Work Step by Step

9 is negative, so instead of adding 9, we subtract 9. When we do this, we obtain the following solution: $12-9=3$
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