Write the Word or Phrase That Best Completes Each Statement $$\left( \frac { 2 x ^ { - 4 } y ^ { 4 } } { 5 x ^ { 5 } y ^ { - 5 } } \right) ^ { - 3 }$$

Short Answer

Write the word or phrase that best completes each statement or answers the question.
- $$\left( \frac { 2 x ^ { - 4 } y ^ { 4 } } { 5 x ^ { 5 } y ^ { - 5 } } \right) ^ { - 3 }$$