The sum of 12 and the product of 9 and a number results in 57

If i read this correctly then the answer would be 
57-12= 45
45/9= 5

The answer is 5

Ok, first we write it as an equation.
12+ 9n = 57.
Then, subtract 12 from each side.
12 - 12 + 9n = 57 - 12.
9n = 45.
Then, divide each side by 9.
n = 45 divided by 9.
n = 5.
Hope it helps! :)

The answer is the third choice

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.