#### 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, $5(9r)=(5\times9)r=(45)r=45r$.

Published by
Pearson

ISBN 10:
0321969359

ISBN 13:
978-0-32196-935-4

45r

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