Please help me with this

Question

Find the amplitude and midline.

y= 20-7sin t/10

Answer 1

y = Asin(B(t+C)) + D

For this case, D= 20, A=-7. sin(anything) range is -1 to +1. So the range of y is 13 thru 27.

(27+13)/2 = 20 which is the midline.

Answer 2

20 = midline

7 = amplitude