What is the correct answers​

What is the slope of the line that contains the points (4,8) and (9,8)? what type of line is it?

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).

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !