Answer
$$+10.$$
Work Step by Step
We simplify by removing parentheses as follows
$$-8+(+9)+(-3)-(-12)=-8+9-3+12=+10.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 2 - Cumulative Review - Page 134: 19
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