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