Which expression is equivalent to StartFraction (3 m Superscript negative 1 Baseline n squared) Superscript negative 4 Baseline Over (2 m Superscript negative 2 Baseline n) cubed EndFraction? Assume 2 m squared n Superscript 5 StartFraction 81 m squared n Superscript 5 Baseline Over 8 EndFraction 2 m squared n squared StartFraction 81 m squared n squared Over 8 EndFraction