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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).

Solve: 3x+y=6 4x-2y=18 show all work !

What statement is true? 2x^2-9x+2=-1