Answer
Valerie added instead of subtracting.
Work Step by Step
When you subtract from a negative number, the final answer becomes more negative, not more positive. Thus, the correct approach is:
$$ = -6-6 \\ =-12$$
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 - 9.2 Adding and Subtracting Signed Numbers - 9.2 Exercises - Page 640: 71
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