Which characteristic does a translation not preserve

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).

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

The reflexive property of congruence lets you say that ∠pqr ≅