exam Maths Puzzle Numerical Ability

Rational exponents:text states:rewrite each expression with a positive rational exponent, simplfy if possiable- proble # 48 (8/125)^-1/3

I cant figure it out thanks Tammy

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exam Other Question
what does it mean when there is a line over a variable? meera mother is four times as old as meera. after 5 years her mother will be three times as old as she will be then what are their present age.