checking my work. which one?

Answer:
Dividing exponents you subtract.
3^8/3^5 = 3^3
3^3
Multiplying exponents when an exponent is raised to another.
(3^3)^3 = 3^9
Apparently this makes no sense according to comments, if you want a more indepth look into exponents search "The properties of exponents".
Answer:
3^6
Step-by-step explanation:
300,000,000/300,000=1,000 + ^3 = 1,000,000
<3 Enjoy,
Dea