Rearrange the literal equation below to solve for x.
2x = 8y + 12

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).

Anyone know? will mark brainliest if you're correct!

Describe the domain and range of y=2(3)^x-2+5