Answer:
4cos4x
Step-by-step explanation:
let's use cos
amplitude=4
period=pi/2
2pi/x=pi/2
x=4
no phase shift
y=4cos4x
pic from desmos
12=8 18=12 24=16 (find 2/3 of each one)
So 8, 12 and 16
In my opinion I think you would be able to make atleast 2 outfits
30kx - 6kx = 8
24kx = 8 /(÷8)
3kx = 1
x = 1/3k