exam Maths Puzzle Numerical Ability

Write without negative exponents.
(3x^-4y^2)^-3

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exam Other Question

x+3y=9
-2x-6y=-18 can you please show me the solution and answer to this problem, my daughter is having a hard time time on this one......five times a number diminished by 9 exceeds twice the number by 6. find the number