Determine the amplitude and period of the following function without graphing.
y = 7 cos x
show your work
The amplitude of a function of the form y = A cos(Bx) is equal to the absolute value of A. In this case, A = 7, so the amplitude is 7.
The period of a function of the form y = A cos(Bx) is equal to 2π/B. In this case, B = 1, so the period is 2π/1 = 2π.