You and your best friend are both on the swim team. You want to beat your friend at the next swim meet so you decide to swim 15 1515 minutes longer than she does one day at practice. Write an equation for the number of minutes you swim, y yy, when your friend swims x xx number of minutes. You swim 55 5555 minutes. How many minutes did your friend swim? minutes

Figure it out your self

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.

The total would be 40.53