The graph of f(x) = 2x3 +x2 – 4x – 2 is shown. how many of the roots of f(x) are rational? a.) 0 b.) 1 c.) 2 d.) 3

I'm so close to finishing all these.

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).

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items