The sum of the digits of a 2-digit number is 12. When the digits are reversed, the resulting number is 18 less than the original number. What is the original number?

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).

Solve: 3x+y=6 4x-2y=18 show all work !

What statement is true? 2x^2-9x+2=-1