Mom baked 200 cookies dad baked 200 what was the total amount of cookies they both made

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