Answer
See the explanation below.
Work Step by Step
Let $p,q$ and $r$ are real numbers that defines associative property .
For addition property $(p+q)+r=p+(q+r)$
For multiplication property $(pq)q=p(qr)$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 1 - Section 1.2 - Operations with Real Numbers and Simplifying Algebraic Expressions - Exercise Set - Page 29: 163
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