12.68 is greater than 12.8 because 68 is better than correct

That is incorrect. 12.8> 12.68. When looking to see what is greater, look at the first place after the decimal. 8 is greater than 6, therefore 12.8 is greater.

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.