What are equivalent fractions 1 2/3 1 2/3

2/3 is a fraction in simplest form
4/6, 8/12, 20/30 are all equivalent to 2/3, because they can be simplified to 2/3.

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.