Answer
$\approx 12.17$
Work Step by Step
From the law of cosines
$x^{2}=18^{2}+10^{2}-2\times 18\times 10\times \cos 40=424-360\times \cos 40\approx 148.22$
$\Rightarrow x\approx \sqrt {148.22}\approx 12.17$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 6 - Section 6.6 - The Law of Cosines - 6.6 Exercises - Page 521: 22
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