What is square root of 76 approximated to the nearest tenth?
is it 8?

Approximately 8.7178, 8.7 to the nearest tenth 

The answer is c. 7 (i think) i’m almost sure though

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.