The price of a new motorcycle is 7000 but the value drops by 9% each year. the function v(t) = 7000•0.91t models this situation for v dollars and t years. what is a realistic domain for this situation

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.