We havenʻt learned this in class yet. Can someone explain it to me please?

Answer:
4
Step-by-step explanation:
[tex] \boxed{ \boxed{formula: \: \frac{ {a}^{m} }{ {a}^{n} } = {a}^{m - n} }} \\ \\ \frac{ {3}^{8} }{ {3}^{4} } \\ \\ = {3}^{8 - 4} \\ \\ = {3}^{ \boxed{4}} [/tex]