Period, Amplitude, and Midline of equation

Question

State the period, amplitude, and mid-line of y = 7 sin(4(t + 7)) − 8

Answer 1

In the form y=Asin(B(x-C)+D 

A is the amplitude

the period is 2π/B

D is the midline

 

so,

 

amplitude is 7

period is 2π/4 or π/2

midline is at y=-8