Danielle wants to treat her friends to a night at the movies . The movie tickets cost $9.50 and she wants to spend $20 on popcorn and candy. If she has $130 dollars to spend, how many friends can she invite?

130-20 that is 110 that’s how much she can spend on friends so if we round the 9.5 to 10 and divide 110 by 10 you get 11 friends

Figure it out your self

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.