Me solve this probability problem, i don't understand conditional probability that well

The line y = x + passes through (−3, 7) and is parallel to y = 4x − 1.

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).

What is the image of c for a 90° counterclockwise rotation about a? (3, 7) (-1, 3) (7, 3)