Your friend Glady's was working a percent problem. She ask you if she did the mathematical problem correctly? If she did not make any errors, explain how you know she worked the problem correctly. If she made an error, correct and explain to Glady's where you think she worked the problem incorrectly. Glady's Solution: 80 X 50 = 4,000?

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.