What is the following sum?
1 2 {/18x2y- 4(/54x9y5)

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).

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

Answer! if you don’t mind, can you explain