#### Answer

$7$

#### Work Step by Step

$x^{2}=3^{2}+8^{2}-2\times 3\times 8\times \cos 60=9+64-48\times \dfrac {1}{2}=49\Rightarrow x=\sqrt {49}=7$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$7$

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