Answer
See below
Work Step by Step
Angle $A=90^\circ-55^\circ-7^\circ=28^\circ$
Using law of cosines:
$$a^2=b^2+c^2-2bc\cos A\\a=\sqrt 890^2+470^2-2\times890\times470\cos 28^\circ\approx523.76$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 13, Trigonometric Ratios and Functions - 13.6 Apply the Law of Cosines - 13.6 Exercises - Problem Solving - Page 894: 48
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