If X and Y are independent random variables with variances o^2 (X) = 8 and o^2 (Y) = 5, find the variance of the random variable Z = -8X + 4Y – 6.​

Most of the people don’t make the sense of taking it

The answer that i got was 8/3

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.