Name two different numbers that round to 30 when rounded to the nearest 10

39 and 36. both of them rounded to the nearest 10 is 30

Any number above 25 rounds to 30 and any number below 35 rounds to 30

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.