Dotty starts up a small business manufacturing bobble-head figures of famous soccer players. Her initial cost is $3300. Each figure costs $4.50 to manufacture.

(a) Write a cost function C, where x represents the number of figures manufactured.

(b) Find the revenue function R if each figure in part (a) sells for $10.50.

(c) Give the profit function P.

(d) How many figures must be produced and sold for Dotty to earn a profit?