Answer
a) 13.5
b) if $a=b$
Work Step by Step
a) The opposite of $-8.7$ is $+8.7$, so you add 4.8 and 8.7 to get the answer.
b) if $a=b$, then $a-b=0$, and $b-a=0$. Therefore, $a-b=b-a$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 1 - Foundations for Algebra - 1-5 Adding and Subtracting Real Numbers - Got It? - Page 32: 3
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