If f(x) = 3x squares and g(x) = 1-x, what is he value of (f-g)(2)

(hurry! ) which expression is equivalent to the following complex fraction?

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)

Cal's go cart has a gas tank with the dimensions shown below. he uses a gas can that holds 11 gallon of gas, to fill the go cart tank. 11 gallon = 231 inches^3 how many full gas cans will it take to fill the go cart's gas tank?