What is the distance between the following points?

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).

Which expression is equal to (f+g)(x)?

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2