As a reward for achieving their goals, all students in the ninth grade are invited to an ice cream party. Write an expression that could represent an estimated cost for the party. Use at least one letter. State what each part of the expression represents.

Write the equation using the "WIRIS editor" button .

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.