Answer
$15$
Work Step by Step
The expression $a-(-b)$ simplifies to $a+b.$ Hence, the given expression, $
6-(-9)
,$ simplifies to
\begin{array}{l}\require{cancel}
6-(-9)
\\\\=
6+9
\\\\=
15
.\end{array}
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 1 - Introduction to Algebraic Expressions - Study Summary - Practice Exercises - Page 74: 23
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