Omar, Amare, and Jack paid a total of $68.25 for dinner and tickets to a concert. The concert tickets cost $9.75 each. If the 3 friends split the dinner bill equally, how much did each friend
spend on dinner?

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.