The expression is \(\left(m^{-3} n^{4}\right)^{-4}\). According to the power of a power rule, \((a^b)^c = a^{b \cdot c}\). Apply this rule to both \(m\) and \(n\):
\[
\left(m^{-3}\right)^{-4} \cdot \left(n^{4}\right)^{-4}
\]
Step 2: Simplify the Exponents
Multiply the exponents for each term:
\[
m^{-3 \cdot (-4)} \cdot n^{4 \cdot (-4)}
\]
\[
m^{12} \cdot n^{-16}
\]
Step 3: Rewrite Negative Exponents
Rewrite \(n^{-16}\) as \(\frac{1}{n^{16}}\) to eliminate the negative exponent:
\[
m^{12} \cdot \frac{1}{n^{16}} = \frac{m^{12}}{n^{16}}
\]