Could someone help me with how you find the period, range and amplitude of a cosine function? This is the question I need to figure out but even if you could make another function (if you don't want to give me the answer) and explain it to me so I know it for my test.
Thank you (:
Find the period, range, and amplitude of the cosine function.

y = –3 cos 4x (1 point)
period = 3; range: –3 ≤ y ≤3; amplitude =
period = ; range: –3≤y≤3; amplitude = –3
period = ; range: –3≤y≤3; amplitude = 3
period = 3; range: –3≤y≤3; amplitude =

Question

Could someone help me with how you find the period, range and amplitude of a cosine function? This is the question I need to figure out but even if you could make another function (if you don't want to give me the answer) and explain it to me so I know it for my test. 
Thank you (:
Find the period, range, and amplitude of the cosine function.

y = –3 cos 4x  (1 point)
period = 3;  range: –3 ≤ y ≤3;  amplitude = 
period = ;  range: –3≤y≤3;  amplitude = –3
period = ;  range: –3≤y≤3;  amplitude = 3
period = 3;  range: –3≤y≤3;  amplitude =

anonymous · Answer

@dpaInc

anonymous · Answer

remember this:

$\large y=Acos(Bx-C)+D $

amplitude is |A|
period is 2pi/B
range is:  (D-|A|) <= y <= (D+|A|)

anonymous · Answer

I think it's c.

anonymous · Answer

the period is mission in part c... (or did not copy correctly)

anonymous · Answer

for part c it is 1/2pi for the period