exam Maths Puzzle Numerical Ability

simplify: ( -2y^3/5)^3

solving I get 8y^9/5 if I simplify is it -2y^9/5?

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exam Other Question

For the pair of functions, perform the indicated operation.
f(x)=4x^2-7x,g(x)=x^2-3x-28
Find f/g Enrique puts 12% of his monthly paycheck in an IRA IF he invests $72 in his IRA, how much was his paycheck?