Let the function f(x) have the form f(x) = Acos(x + C). To produce a graph that matches the one shown below, what must the value of A be?

A. 2
B. 3
C. 4
D. 1

http://assets.openstudy.com/updates/attachments/5314c831e4b016ae565b309d-hoopshiree-1393871135554-bc9775d176eb4505918aa54a1c0ecc0c.jpg

Question

Let the function f(x) have the form f(x) = Acos(x + C). To produce a graph that matches the one shown below, what must the value of A be?

A.	2
B.	3
C.	4
D.	1

http://assets.openstudy.com/updates/attachments/5314c831e4b016ae565b309d-hoopshiree-1393871135554-bc9775d176eb4505918aa54a1c0ecc0c.jpg

zzr0ck3r · Answer

can you tell the amplitude from the graph?

anonymous · Answer

I hiccuped. That's the wrong image.

zzr0ck3r · Answer

I ask you the same question.

anonymous · Answer

A is the amplitude. It's 4?

zzr0ck3r · Answer

it is the distance from the mid line to the maximum point on the graph.

zzr0ck3r · Answer

correct

anonymous · Answer

Is that the answer?

zzr0ck3r · Answer

yes, but the question is worded badly. It shuold ask for the absolute value of the A.

As it could be -4 or 4

anonymous · Answer

Thanks! I feel silly now, but I won't make the mistake again!

Yeah I see that. It's not my question, I just have to go along with it. Thanks for the help.

anonymous · Answer

Refer to the attached plot.