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23 March, 08:01

Suppose a countrys population in 1980 is 210 million. In 1990 it was 225 million using the A = 210 million if t=0 in 1980 find the value of t in 1990

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  1. 23 March, 11:14
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    P=Ae^kt

    225 = 210 * e^ (k * (1990-1980)

    225/210=e^10k

    ln (225/210) = 10k

    k=ln (225/210) / 10=0.0069

    P = 210*e^ (0.0069t) for 2000 = = = > t = 2000-1980=20

    P = 210*e^ (0.0069*20)

    P=241.0749=241
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