Answer:
m^2/n
Step-by-step explanation:
The following laws of exponent are useful to this problem:

We are given the expression:

Use the first law of exponent above.

Make sure to recall the important necesscary fundamental math such as operation with negative numbers/integers, basic division, fraction, etc.
From the expression, apply the second law of exponent to n^-1.

Multiply m in.

Thus the answer is m^2/n.