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The function P (t) gives the number of insects in a population at time t. The birth rate for the insects is 6.7 % per unit of time and the death rate is 2 % per unit of time. Give the rate of change of the population with respect to time in terms of P.

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  1. 8 May, 09:37
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    dP/dt = 0.047P

    Step-by-step explanation:

    - Let P (t) be the number of insects at time t.

    - Let the birth rate for the insects be b (t, P), then b (t, P) = 6.7% = 0.067

    - Let the death rate for the insects be d (t, P), the d (t, P) = 2% = 0.02

    The number of insects between time t and t + Δt is given as

    Total birth = bPΔt

    Total death = dPΔt

    The rate of change of population with respect to time is

    ΔP = bPΔt - dPΔt

    ΔP = (b - d) PΔt

    ΔP/Δt = (b - d) P

    Taking the limit as ΔP approaches 0

    dP/dt = (b - d) P

    Using the values of b and d, we have

    dP/dt = (0.067 - 0.02) P = 0.047

    dP/dt = 0.047P
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