Simplify: 3(-2x+5z)+2(3z-2y)+7(x-3z)

Write the expression in simplified radical form. show all steps and work including any foil method work. (hint: use the conjugate. no decimal answers.) (9-2√3)/(12+√3)

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).

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000