
Concept explainers
(a).
To graph:
The data points and the model in the same viewing window.
(a).

Explanation of Solution
Given:
The numbers of hours
Graph:
(b).
To find:
The period of the model.
(b).

Answer to Problem 66E
The period is
Explanation of Solution
Given:
The numbers of hours
Calculation:
The sine function is:
According to the question
So, substitute
Also, from the year calendar, there are
Yes, the period and the months in a year is the same.
Conclusion:
Hence, the period is
(c).
To find:
The amplitude of the model.
(c).

Answer to Problem 66E
The amplitude is
Explanation of Solution
Given:
The numbers of hours
Calculation:
The sine function is:
According to the question
So, substitute
This amplitude represents the maximum change in hours of daylight.
Conclusion:
Hence, the amplitude is
Chapter 4 Solutions
Precalculus with Limits: A Graphing Approach
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