Answer:
Last option: Keep the base the same and then subtract the exponents.
Explanation:
There is a property called "Quotient of power property".
This property states that if you need to divide two powers with the same base, you must keep the same base and subtract the exponents:
![(a^m)/(a^n)=a^((m-n))](https://img.qammunity.org/2020/formulas/mathematics/middle-school/t4p6lk17njgjnsyurligaff1ztbfz1a66v.png)
Then, you need to apply this property to the expression
to simplify it.
Therefore, you get that the expression simplified is:
![3^((-6-(-4)))=3^((-6+4))=3^(-2)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/3a92hxe7wvk4fvs78u24ockiutrz0m9w8w.png)