exam Maths Puzzle Numerical Ability

Simplify and evaluate:
(4^2x^3y^(-2)z^(-3)/x^(-5)y^8z^(-9))2

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exam Other Question

factoring a quadratic with leading coefficient greater than one
y^2-10-39 Does anyone know how to do this problem?

I need to find the constant of variation k

M varies directly with N; M = 144 when N= 8

Thanks,
sher