exam Maths Puzzle Numerical Ability

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simplify

-2/-2^-3 - 3/-3^-2

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exam Other Question

x^3 - 4x^2 - 21x = 0 HG and EF are bases, HI-height,

If HG=14, HI=2x+2, EF=4x+4, area=170, find x, HI, and EF.