Which are cubic functions? check all that apply. a. f(x) = –4 – 2x + 5x3 b. f(x) = –3x – 1 c. f(x) = –x2 + 5x – x3 d. f(x) = x2 – 6x3 + 2x4 + 1 e. f(x) = 2x3 + 3x2 – x – 3 f. f(x) = 3x2 – 1 – 8x

A f(x) = –4 – 2x + 5x3

C f(x) = –x2 + 5x – x3

E f(x) = 2x3 + 3x2 – x – 3

Step-by-step explanation:

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you