Write Using Positive Exponents -3m^-2np^-4

$- 3 m^{- 2} n p^{- 4}$

Move $m^{- 2}$ to the denominator in $m^{- 2}$ using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{m^{2}}$

Move $p^{- 4}$ to the denominator in $p^{- 4}$ using the negative exponent rule $b^{- n} = \frac{1}{b^{n}}$ .

$\frac{1}{p^{4}}$

Rewrite $- 3 m^{- 2} n p^{- 4}$ with positive exponents.

$- 3 \frac{1}{m^{2}} n \frac{1}{p^{4}}$