Identify whether each of the following expression is a quadratic expression in one variable. Give reason for your anwser a.
b.
c.
d.
e.
f.

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).

Will give brainliest what is the value of x? enter your answer in the box.

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7