Intermediate Algebra (12th Edition)

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



Work Step by Step

The associative property of multiplication holds that $a(bc)=(ab)c$ (for real numbers $a$, $b$, and $c$). Therefore, $5(9r)=(5\times9)r=(45)r=45r$.
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