Which is an exponential decay function? f(x) = 0.2 Five-thirdsx f(x) = –3.1x f(x) = 10x f(x) = −2(0.7)x

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).

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Simplify (8x2 − 1 + 2x3) − (7x3 − 3x2 + 1). −5x3 + 11x2 − 2 5x3 − 11x2 + 2 x3 + 2x2 + x3 x3 − 2x2 − x3