An investment is currently worth 2.125 × 10^4 dollars . ten years ago, the investment was worth 1.25 × 10^3 dollars. how many times greater is the value of the investment today than the value of the investment ten years ago?

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.