A man bought 150 magazines for 450$, he sold the half of them at a profit of 20% , 50 of the magazines at a profit of 10% and the rest at a loss of 4% a) how much did he receive from the sales.?

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.