At the end of the year, cars made in the current year are marked down to make room for next year's models. one particular model had a sticker price of $42,030 when it was new. after being marked down, the price is now $37,827. what is the percent of decrease in the price of the car?

Where is the problems

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.