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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).

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

Write an expression that shows 3 more than 5 times a number