Answer
$(9x)^\circ=90^\circ$
$(9x)^\circ=90^\circ$
Work Step by Step
The sum of the two angles is a straight angle ($180^\circ$):
$(9x)^\circ+(9x)^\circ=(18x)^\circ=180^\circ$
$x=10$
$(9x)^\circ=90^\circ$
$(9x)^\circ=90^\circ$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 5 - Trigonometric Functions - 5.1 Angles - 5.1 Exercises - Page 504: 28
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