ANSWER:
[tex]\frac{b^3}{a^4}[/tex]
STEP-BY-STEP EXPLANATION:
We have the following expression:
[tex]\frac{a^3b^5}{a^7b^2}[/tex]
When it is a quotient, and it is the same base, the exponents are subtracted, therefore
[tex]\frac{a^3b^5}{a^7b^2}=a^{3-7}b^{5-2}=a^{-4}b^3=\frac{b^3}{a^4}[/tex]
