Calculus

If A=125e^-kt and A=200 when t=3, find the value of k.

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  1. Substitute your known A and t values.
    200 = 125 e^-3k
    e^-3k = 200/125 = 1.6
    Take natural logs of both sides.
    -3k = ln 1.6 = 0.470
    Solve for k

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