Mathematics (AS & A Level) · Oct / Nov 2021 · Paper 33 · Question 10
9709
As printed in the paper
The question as text
A large plantation of area 20 km2 is becoming infected with a plant disease. At time t years the area infected is x km2 and the rate of increase of x is proportional to the ratio of the area infected to the area not yet infected. When t = 0, x = 1 and dx dt = 1.
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Show the answer and mark scheme
10(a)[2]
10(b)[5]
10(c)[3]
10(d)[1]
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