Finding the angle measures using triangles

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).

Rectangle leg this 11feet and perimeter of 38feet what is the width of the rectangle in feet

Which expression will have the same sum as 3_8 + 1/4?