Mathematics (AS & A Level) · May / June 2018 · Paper 31 · Question 6
9709
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In a certain chemical reaction the amount, x grams, of a substance is decreasing. The differential equation relating x and t, the time in seconds since the reaction started, is dx dt = −kx t, where k is a positive constant. It is given that x = 100 at the start of the reaction.
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6(i)[5]
6(ii)[3]
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