Can you help me answer these questions please?

The demand for computers is represented by P_D= 84 - 2Q and the supply for computers is represented by P_S= 3Q + 4. Determine for each of the following prices if it is a price floor, price ceiling, or neither. For each price determine the quantity shortage or surplus.

a)P = $64.

Price ceiling/floor/neither

Surplus/shortage/neither

Amount =

b)P = $40.

Price ceiling/floor/neither

Surplus/shortage/neither

Amount =