I think I know how to do C – but the rest are a bit cloudy, can you assist?

I think I know how to do C – but the rest are a bit cloudy, can you assist?

Question #1 

Suppose that the (inverse) demand curve for Cranberries is given by P = 40 − 6Q and TC = $4Q + $3Q2

A.      What is equilibrium Price and Quantity and Profit if the market is competitive? 

B.      What is equilibrium Price and Quantity and Profit if there are two firms in the market (note Q = q1 + q2)? 

C.      What is equilibrium Price and Quantity and Profit if there are monopoly in the market (note Q = Q)?