exam Maths Puzzle Numerical Ability

Simplify
(2x^-6y^-4z^0/3^-2x^-2y^-8z^5)^3

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exam Other Question

If points A,B and C lie on a coordinate line and points A and B have coordinates of 15 and 7 respectively, then which of the possible coordinates for point C satisfy(ies) d(A,C)< d(B,C)? prove that if two tangents TP and TQ are drawn to a circle with centre O from an external point T, then anglePTQ=2*angleOPQ