A store is having a 20% off sale. Michael says that he can find the sale price of an item that has a regular price of p by evaluating the expression 0.8p. Susan says that she can find the sale price for the same item by evaluating the expression p-0.2p. who is correct

Iknow one of the answers is a and maybe b but not 100% sure about b

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.