The least common multiples of two numbers is 20. the diffrence of the two numbersis 1

4:   4 8 12 16 20
5:   5 10 15 20 
The distance between them is 1,
so the answer is 4 & 5.

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.