Answer
+18
Work Step by Step
Change the sign of the number being subtracted, then add.
$(+9)-(-9)=(+9)+(+9)=+18$
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 2.2 - Subtraction of Signed Numbers - Exercises - Page 112: 32
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