Find the missing side lengths.

Need help please.

This is the 6th time I post.

Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).

Two lines parallel to the same plane are parallel to eachother

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)