College Math prblem.. PLEASE HELP!!?

[LucyLu]

The problem: The Film Frisbee Company is working on a new type of Frisbee to sell on the toy market. They have studied all aspects and determined that the cost of producing "x" number of Frisbees would be represented by the equation C(x)=100,000-108x+0.045x^2

1.) What would be the value of "x" that would provide the minimum cost of production? What is the minimum cost?

They also determined that the revenue for selling "x" units would be best if they used the equation R(x)=x^2+2,400x+1,000
2.) What would be the value of "x" that would provide the maximum revenue of the production? What is the Maximum revenue?
3.) What would be the maximum Profit that the company could expect?

* I have to show work*
PLEASE help even if it is a little!!