Can anybody tell me what it is ? and i'll u with a problem

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).

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?

When is g(x) = 0 for the function g(x) = 5.23x + 4?