Answer
$\theta=108.44$
Work Step by Step
The vector point west: $-i$
$\theta=cos^{-1}[\frac{(40i-120j)(-i)}{\sqrt {(40i-120j)(40i-120j)}\sqrt 1}]=cos^{-1}\frac{-40}{126.49}=108.44$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 8 - P.S. Problem Solving - Page 626: 10d
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