Answer
-12
Work Step by Step
Sum all the positive addends. Sum all the negative addends. Find the sum of the two.
$(+1)(-4)+(-2)+(+2)+(-9)=(+3)+(-15)=-12$
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 110: 59
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