#4. At the beginning of the school year, Mr. Wilson made a trip to a bulk supply shop. Large boxes of pencils cost $15 each, and cases of paper cost $30 each. He can spend
no more than $180. Write an inequality to represent the boxes of pencils x, and cases
of paper y, that Mr. Wilson can purchase.

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.