When a figure is rotated, it's angle measures 1. remain the same 2. may change , and it's orientation 1. remain the same 2. may change

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).

How is working backward similar to solving an equation?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.