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34. (a) Express (4- x)(2- x) in partial fractions. (2) The mass, x grams, of a substance at time t seconds after a chemical reaction

34. (a) Express (4- x)(2- x) in partial fractions. (2) The mass, x grams, of a substance at time t seconds after a chemical reaction starts is modelled by the differential equation dx dt = k(4 - x) (2- x), 120, 0

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