Alyssa has a credit card with an APR of 14.25%. If she charges $900 of goods on her estimated amount that Alyssa will pay in finance charges on her purchases?

There is no question, there is just the answer.

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.