Pls Help! David deposited $3,500 in two banks. The first bank paid 2% simple interest per year while the second bank paid 3%. At the end of one year, the difference in the interest amounts was $30. Find the amount David deposited in each bank.

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.