Hi can you please explain all the parts? I really don't understand.

Question 7 : Consider the following situation A firm is in the market for producing widgets. You are tasked with finding the optimal quantity of widgets to produce given the following information. The market price as a function of quantity is given by P(Q) = 1800 - 3Q The total cost function is given by C(Q) = Q3 - 2Q2 + 25Q + 5000 a. Write down the Total revenue function for this firm R(Q) b. Write down the Profit function for this firm II(Q) c. What is the Marginal Revenue function MR(Q)? d. What is the Marginal Cost function MC(Q)? e. What is the optimal quantity Q that this firm should produce to maximize profits? f. What is the maximum and minimum profit that this firm can achieve