an open top rectangular box has a square base and it will hold 110 cubic centimeters (cc). each side of the base has length x cm, and the box has a height of y cm. express the surface area S as a function of the length c of a side of the base

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.