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1.7.20 Constructing differential equations (A-level only)

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Question 8

The monthly rate of increase of a fish population in a reservoir is equal to 1.5% of the current population. P P\,P is the population in hundreds and t t\,t is the time in months.

a.

Write down a differential equation for this relationship.

[2]
b.

Show that P=Ae0.015tP = Ae^{0.015t}P=Ae0.015t where A A\,A is a constant.

[4]
c.

Given that the initial population is 800 fish. Find the population after 2 years (24 months), to the nearest whole number.

[2]

1.7.20 Constructing differential equations (A-level only) Questions

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