Answer
$13$
Work Step by Step
$|\textbf {u}|=\sqrt {5^{2}+12^{2}}=\sqrt {25+144}=\sqrt {169}=13$
Trigonometry 7th Edition
by McKeague, Charles P.; Turner, Mark D.
Published by
Cengage Learning
ISBN 10:
1111826854
ISBN 13:
978-1-11182-685-7
Chapter 7 - Test - Page 416: 23
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