A rolling pin has a diameter of 4 inches. If Lin rolled it across the table and it made 20 rotations, how far did it travel? Round to the nearest tenth

Move the decimal behind it

A. is the answer in this question

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.