Answer
-9
Work Step by Step
To add two negative numbers, add the absolute values and place a negative sign on the result.
$(-4)+(-5)=-|4|+|5|=-9$
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: 21
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