SOLUTION: Identify the period. y = 100 sin [π/9 (t + 4)] Select one: a. π/22 b. 11 c. 22 d. 22π

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Question 1093717: Identify the period.
y = 100 sin [π/9 (t + 4)]
Select one:
a. π/22
b. 11
c. 22
d. 22π

Answer by greenestamps(13203)   (Show Source): You can put this solution on YOUR website!

The general form for a sine of cosine function is



In that form...
a is the amplitude;
b determines the period; (the period is (2pi)/b)
c is the horizontal shift; and
d is the vertical shift.

With your function, the period would be


That is not any of the given answer choices....

Since all of the answer choices involve the number 11 or 22, I suspect the given function is supposed to have b equal to (pi/11) instead of (pi/9). In that case, the period would be


answer choice C

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