As long as they have the same base (in this case a), to divide you just subtract the exponents.
a3 ÷ a2 = a(3-2) = a
15
It is 1/81.
One third is already in it's simplest form.
6N/7
1/3 is the simplest form.
1 and 1/3 is in its simplest form.
Yes.
12,500
2/9
The simplest form for four thirds is one and one third.
Two thirds.
It is one third.