Modeling a cosine function [see attachment] what is the period and what is b

it takes 1 second one way, and 1 second to go back to its original position, thus the period is 2 seconds.

(n^3 - n)

= n(n-1)(n+1)

since it is divisible by 3 and 2 ,because it is a multiple 3 consecutive number

if, n-1 is odd then n+1 is also odd, then it is a multiple of 9

but if, n-1 is even then n+1 is also even, then it is a multiple of 4

so, largest multiple = max(9*2, 4*3) = max(18, 12) = 18

i think the answer is b.

step-by-step explanation:

not 100% sure though.