exam Maths Puzzle Numerical Ability

Write with positive exponents:

9x(x^-3)/18x^15

(3^-3a^-2b^5/c^-3d^-4)

x^-3y^-2/z^-4

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exam Other Question

Eight times the sum of a number and -2 is the same as nine times the numbers. Find the number. Find the mean and the median.
-7, -1, 3, 9, 10, 16