exam Maths Puzzle Numerical Ability

-x^3(9-x^2)^(-1/2)+2x(9-x^2)^(1/2)

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exam Other Question

x^-1.5=27 . . . . . . I know that the answer is 1/9, but I have no idea how to get there. (Square root of)12xy *(times) (the cubed root of)9x2y * (the fourth Root of) 15x3y2 * (the 8th root of)24x5y7