Solve the Problem $$\text { supply: } \mathrm{p}=\frac{1}{3} \mathrm{q}^{2} ; \quad \text { demand: } \mathrm{p}=-\frac{1}{3} \mathrm{q}^{2}+33$$

Solve the problem.
-Suppose the supply and demand for a certain videotape are given by:
$$\text { supply: } \mathrm{p}=\frac{1}{3} \mathrm{q}^{2} ; \quad \text { demand: } \mathrm{p}=-\frac{1}{3} \mathrm{q}^{2}+33$$
Where $p$ is price and $q$ is quantity.
How many videotapes are demanded at a price of $\$ 16$ ?

A) About 7
B) About 9
C) About 8
D) About 6