Help with Algebra 2, PLEASE? Will Fan and give medal. (:
3. The same wax will be used to make each candle, and it costs 3/4 of a penny per cubic centimeter. Write polynomial functions to show the cost of the wax that is used for making each candle for different values of x.
I have two different candles. One is called The Brick and has a volume of x^3 - x^2. (^ represents exponent) The other is called The Egyptian and has a volume of 1/3x^2 + 7x.

Question

Help with Algebra 2, PLEASE? Will Fan and give medal. (:
3.	The same wax will be used to make each candle, and it costs 3/4 of a penny per cubic centimeter. Write polynomial functions to show the cost of the wax that is used for making each candle for different values of x. 
I have two different candles. One is called The Brick and has a volume of x^3 - x^2. (^ represents exponent) The other is called The Egyptian and has a volume of 1/3x^2 + 7x.