Answer:
2
Step-by-step explanation:
From the graph, we obtain the trigonometric function as:

The corresponding cosine function have equation.

This function is of the form: 
where
is the amplitude.
Therefore the amplitude is |2|=2
The third choice is correct
Answer: Could we see the circle we need to find the circumference for?
Step-by-step explanation:
B C=0.1 and D=0.1
I think you ment c not b for the third one so I wrote the answer to
25/66
5/6 x 11/5
5/6 x 5/11
5 x 5
6 x 11
25/66
Consider f(x)=y.

Simplify the equation f(x)=y to obtain the value of x in terms of y.

So inverse of function is,

Correct nswer is A part.