Yall im thinking A or B but can someone help?​

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 this equation using substitution. {4x + y = −2} {4x + 6y = 44}

What are the domain and range of the function f(x)=2^x+1