Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 6 - 6.4 - Graphs of Sine and Cosine Functions - 6.4 Exercises - Page 467: 86c

Answer

See graph Between 124 day and 252 day.

Work Step by Step

Using a graphing utility, the graph of the model is as shown. At $C=40$, is between $t=123.86\approx124$ and $t=252.25\approx252$. Thus, the time of the year when consumption exceeds $40$ gallons per day is between $124$ day and $252$ day.
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