9. Simplify: 5 + (7x + 3) + (-7x)
A) -8x
B) 8x
C) 14x + 8
D) 8

Can you simplify 4/7? 24 points will be awarded!

(urgent ) use pi 3.14 to estimate the circumference of the circle to the nearest hundredth middle is 4in (urgent )

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).