Answer
$-15$
Work Step by Step
RECALL:
$a-b=a+(-b)$
Use the definition of subtraction above to obtain:
$0-15
\\= 0+(-15)
\\= -15$
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 1 - Section 1.6 - Subtraction of Real Numbers - Exercise Set - Page 71: 24
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