Answer
$26,134\text{ units}$
Work Step by Step
(a) For February 2017, $t=2$.
Substitute $t=2$ into the equation:
$$S=23.1+0.442(2)+4.3\cos \left(\frac{\pi(2)}{6}\right)=26.134$$
The predicted sales is then:
$$26.134(1000)=26,134\text{ units}$$
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: 108a
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