simplify. mn^-4/p^0q^-2

To simplify the expression mn^-4/p^0q^-2, we can use the rule that any number raised to the power of zero is equal to 1.

Therefore, p^0 = 1.

Now we have: mn^-4/q^-2

Using the rule that dividing by a negative exponent is the same as multiplying by the positive exponent, our expression becomes:

mn^-4 * q^2

Since multiplying variables with the same base involves adding their exponents, we obtain:

mq^2/n^4

Thus, the simplified expression is a) mq^2/n^4.