exam Maths Puzzle Numerical Ability

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Find the value of the polynomial 2x^2-2x-4 when x=2

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exam Other Question

square root of 64 s to the 4th t to the 3ed A solution of 71% pesticide is to be mixed with a solution of 49% pesticide to form 44 liters of a 51% solution. How much of the 71% solution must you use?