What is 125^(-2/3)?

Firstly, the negative power sign flips the number the 1/125.The 1/3 part of the power means find the cubic (3rd) root. 1/5Finally the 2 of the power means square the number. 1/25 is therefore the final answer.Always remember that what you do to the bottom, you always must do the same to the top of the fraction!