Answer
$-22a$
Work Step by Step
$... (-9)a+(-13)a=...$
Apply the distributive property,
$...=[-9+(-13)]a==\quad$
... same signs in brackets.\ Keep the sign, add the absolute values...
$=-(9+13)a$
= $-22a$
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 1 - Section 1.5 - Addition of Real Numbers - Exercise Set - Page 63: 52
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