Find the greatest common factor of 15 x²y³ and -18 x³yz.
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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).

What is the solution set of the quadratic inequality x^2-5< or equal to 0

What are the solutions of the system? solve by graphing. y = x^2 + 3x + 2 y = 2x + 2