Help help help please I need help I appreciate it ):

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).

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

State if it is acute obtuse or right