Algebra 2 help...

A half life of a certain radioactive is 36 days. An initial amount of the material has a mass of 487 kg. Write an exponential function that models the decay of this material. Find how much radioactive material remains after 5 days. Round your answer to the nearest thousandth.

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asked by Maria
  1. amount = 487 (1/2)^(t/36) where t is the number of days.

    if t = 5
    amount = 487(.5)^(5/36)
    = 442.302 kg

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    posted by Reiny

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