Anna owns an airline and pays the airport $40 for each ticket sold. The amount Anna pays is given by f(x) = 40x, where x is the number of tickets sold. If Anna pays the airport
$400, how many tickets did she sell?
Note: Round to the nearest whole number of tickets.

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.