1. Which of the following equations is equivalent to 2(a + 6) - 3(a - 5) = 18 1. 5a - 3 = 18
2. -a + - 3 = 18
3. 5a + 27 = 18
4. -a + 27 = 18

What values of c and d make the equation true?

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 do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?