exam Maths Puzzle Numerical Ability

what does it mean when there is a line over a variable?

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exam Other Question

Use a special product to square the following binomial.
(2.5m - 0.4n)^2 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