lfcboy

The brightness of the pulsing light varied from 100 mega bulbs to 125 megabulbs, and the light flashes 3 times per second.

If the brightness at t=o is 125 megabulbs, what is the equation of the cosine curve that models the brightness of the light?

I can't find the period. It would be nice if someone would help me find the cosine equation(curve equation). If you can, can you show me how you got it. Thanks!