1. Which set of lengths can form a triangle? A. 10, 10,8
B. 3, 8, 18
C. 30, 80, 10
D. 16, 22, 5

Two because two of one thing is two.

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.