Answer
-12
Work Step by Step
$|-3|+|-9|=3+9=12$
Since both addends are negative, the result is negative.
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 2 - Section 2.1 - Addition of Signed Numbers - Exercises - Page 109: 17
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