Which of the following rates converts to a unit rate of $12.50 per hour?

A. $328.90 per 26 hours
B. $355.60 per 28 hours
C. $307.20 per 24 hours
D. $312.50 per 25 hours

The answer to this question is either b or c

We know on the regular cosine graph, it decreases from 0 to pi. so, we need to set 0 as y.0 = 4 cos(2x-pi)0 = cos(2x-pi)2x-pi = pix = piwe already know the answer, but do pi on your own!