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 - Lesson Check: 9

Answer

The reason that the student is not correct is below.

Work Step by Step

The student is correct for positive numbers. However, we can also consider the opposite of negative numbers. For instance, the opposite of -a is a, so we know that for negative numbers, the opposite will always be positive.
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