Question

write an equation of the cosine function with aplitude of 2, period of 3pi, a phase shift of pi/6 and a midline at y=-4 (mostly need help with the period)

Answer 1

*amplitude

Answer 2

coefficient = 2pi/period

Answer 3

y = Acos(Bx+C) + k
A- amplitude
period = 2pi/B
phase shift = Bx+C
midline or vertical shift = k

Answer 4

so how would i write the period?

Answer 5

just solve for the variables (coefficients) and plug them into the equation

Answer 6

still confused..

Answer 7

coefficient = 2pi/3pi=2/3

Answer 8

oh ok thx