Question

Can someone verify the graph for me please.

Answer 1

The graph for number 11

Answer 2

My best suggestion I could give you would be to visit this website. Free graphing calculator.
https://www.desmos.com/calculator
This will tell you the period of your function, the minimum / maximum values as well as the phase shift. I believe the amplitude you're looking for is 2, since it's usually always the number before your sine / cosine.

Answer 3

okay thank you i'll try it out

Answer 4

done