Answer:
[tex]5^{-8}[/tex]
Step-by-step explanation:
[tex]\sf \boxed{\dfrac{a^{m}}{a^n}=a^{m-n}}[/tex]
[tex]\sf \dfrac{5^{-4}}{5^{4}}=5^{-4-4}[/tex]
[tex]= 5^{-8}[/tex]
