Which of the following would best represent a sine function with an amplitude of 7, a period of pi over 4, and a midline at y = 3?

We are given with
sine function
amplitude = 7
period = π/4
midline , y = 3

The function would have the equation
y = 7 sin 8x + 3
The amplitude is written before the sin function
b = 2π / T = 2π / (π/4)
b = 8
And there is a vertical shift of 3 that is why we add 3

The answer is 109 times per second