Answer
45r
Work Step by Step
The associative property of multiplication holds that $a(bc)=(ab)c$ (for real numbers $a$, $b$, and $c$).
Therefore, $5(9r)=(5\times9)r=(45)r=45r$.
Intermediate Algebra (12th Edition)
by Lial, Margaret L.; Hornsby, John; McGinnis, Terry
Published by
Pearson
ISBN 10:
0321969359
ISBN 13:
978-0-32196-935-4
Chapter R - Section R.4 - Properties of Real Numbers - R.4 Exercises - Page 38: 43
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