exam Maths Puzzle Numerical Ability

I need to rewrite the expression with positive exponents.
1/2x^-2y^-3

Simplify the expression. The simplified expression should have no negative exponents.
(2x^3y^2/3xy)^-3

Please help!

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exam Other Question

Business and finance. Ms. Jordan has been given a loan of $2500 for 1 year. If
the interest charged is $275, what is the interest rate on the loan? Find the LCD,ans convert the expression into an equivalent rationalexpression with the LCD as the denominator.
(3)/4b^2-9, (2b)/2b+3, (-5)/2b^2-3b