You have the following expression:
[tex]\frac{m^{-2}p^{-1}\cdot2pn^2}{(mnp^4)^{0}}[/tex]in order to simplify the previous expression, write each variable with negaive exponent as the inverse with positive exponent. Moreover, conisder that any expression powered to zero is equal to 1:
[tex]\frac{2pn^{2}}{m^{2}p\cdot(1)}=\frac{2n^{2}}{m^{2}}[/tex]Hence, the simplified expression is
2n²/m²