Patty goes to the mall at 10:30 A. M. and meets a friend at a movie at 12:15 P. M. Patty wants to shop and have 50 minutes for lunch before meeting her friend. How much time can Patty spend shopping?

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.