Over what interval is the function in this graph decreasing?

Click on the graphic until you find the right quotient. (36xa - 30xb) ÷ (-6x2)

The system of equations graphed below has how many solutions? y = 2x + 2

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).