exam Maths Puzzle Numerical Ability

Write using positive exponents, and simplify if possible.
(-3x)^-2

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4. Simplify:
3 - √[81] + (-2)3 A right pyramid has a square base that measures 10cm on each side. It's peak is 12cm above the center of it's base. What is the sum of the lengths of the pymramid's eight edges? Ex