What does x equal. if the area is 12 units.

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).

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

If julia has a value of x5.4 that is equivalent to x10.9 true or false. explain