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Math Help - Half-life problem

  1. #1
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    Half-life problem

    I know the formula: A(t)=A(o) 1/2^(t/p), but I don't know how to use it in the following question:

    A certain radioactive material decays exponentially. The percent, P, of the
    material left after t years is given by P(t)=100 (1.2)^-t
    a. Determine the half-life of the substance.
    b. How fast is the substance decaying at the point where the half-life is reached?
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  2. #2
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    Quote Originally Posted by Soul to soul View Post
    I know the formula: A(t)=A(o) 1/2^(t/p), but I don't know how to use it in the following question:

    A certain radioactive material decays exponentially. The percent, P, of the
    material left after t years is given by P(t)=100 (1.2)^-t
    a. Determine the half-life of the substance.

    set P = 50 and solve for t

    b. How fast is the substance decaying at the point where the half-life is reached?

    determine P'(50)
    .
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