Students sold 400 tickets for a playoff football game at school. some tickets are for students and cost $3.00, while the rest are adult tickets that cost $8.00. the total value of all tickets sold was $1580.00.

a. write a system of equations that represents this situation.

This does not make sense

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.