I want help ,i want an answer

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

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).

What is another way to express 36 +32