Answer
$t=30^{\circ}$
Work Step by Step
Since January represents $x=0$, we substitute $x=0$ in the equation,
$t=60-30\cos(\frac{\pi}{6}x)$
$t=60-30\cos(\frac{\pi}{6}\times0)$
$t=60-30\cos(0)$
$t=60-30(1)$
$t=30^{\circ}$
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 3 - Radian Measure and the Unit Circle - Section 3.3 The Unit Circle and Circular Functions - 3.3 Exercises - Page 119: 85a
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