Suppose a firm faces demand of Q = 300 - 2P and has a total cost curve

Question:

Suppose a firm faces demand of Q = 300 - 2P and has a total cost curve of TC = 75Q + Q2.
a. What is the firm's marginal revenue?
b. What is the firm's marginal cost?
c. Find the firm's profit-maximizing quantity where MR = MC.
d. Find the firm's profit-maximizing price and profit.