SOLUTION: what is the amplitude and the period of this graph: y=5cos 3 x I know the amplitude is 5, but what is the period?

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Question 187838This question is from textbook saxon algebra 2
: what is the amplitude and the period of this graph: y=5cos 3 x
I know the amplitude is 5, but what is the period?This question is from textbook saxon algebra 2

Found 2 solutions by stanbon, user_dude2008:
Answer by stanbon(48558) (Show Source):
You can put this solution on YOUR website!
what is the amplitude and the period of this graph: y=5cos 3 x
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General Form: y = a*cos(bx+c)
Amplitude = |a|
Period = (2(pi))/b
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Your Problem:
amp = 5
period = (2pi)/3 = (2/3)pi or 120 degrees
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Cheers,
Stan H.

Answer by user_dude2008(1825) (Show Source):
You can put this solution on YOUR website!
General form: y=a*cos(bx+c)+d

y=5cos 3 x ---> a=5, b=3, c=0, d=0

amplitude: A=abs(a)=abs(5)=5

period: T=2pi/b=2pi/3