Let the function f(x) have the form fx) = acos(x+c). to produce a graph that matches the one shown below, what must the value of a be?

B. 4

Step-by-step explanation:

The given function is of the form:

A is called the amplitude of the given function.

We can read from the graph that, the function ranges between:

-4 and 4

This implies that:

Therefore the amplitude of the function is 4.

Hence the value of A must be 4.