exam Maths Puzzle Numerical Ability

Simplify. Use positive exponents.

(3x^-3 X x^6)/y^-2

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exam Other Question

How do I translate:
"fourteen more than one-half of the sqaure of Z" into a variable expression. Evaluate f(-3). f(x)={-x^2+2x, x<1
{-2x+3, x>1