Answer
$21,452\text{ units}$.
Work Step by Step
(c) For June 2017, $t=6$.
Substitute $t=6$ into the equation:
$$S=23.1+0.442(6)+4.3\cos \left(\frac{\pi(6)}{6}\right)=21.452$$
The predicted sales are then:
$$21.452(1000)=21,452\text{ units}$$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 6 - 6.3 - Trigonometric Functions of Any Angle - 6.3 Exercises - Page 455: 108c
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