A box containing twelve 40-watt bulbs and eighteen 60-watt bulbs is stored in your basement. Unfortunately, the bus is stored in the dark and you need two 60-watt bulbs. What is the probability of randomly selecting two 60-watt bulbs?

I’m not sure what sujevtbis this

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.