exam Maths Puzzle Numerical Ability

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3x^2+2y^2-6x+12y=0

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exam Other Question

Carbon-14 decay question:

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The half-life of readioactive carbon-14 is 5,700 years. How much of an initial sample will remain after 3,000 years?

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Find the horizontal asymptote, if any of the rational function.
f(x)=8x^4+7x-8/x^2-8