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Math Help - worded log problem

  1. #1
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    worded log problem

    I am lost. Please help me solve this. I know it will be simple if I can just see it. Thanx.
    A sample of 500g of radioactive lead 210 decays to polonium 210 acording to the function defined by A(t)= 500e^-.32t,t is for time in years. find the amount of the sample remaining after 4 years. There is more but I think I can find it if I have this part. Thanx
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  2. #2
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    Quote Originally Posted by whiteowl View Post
    I am lost. Please help me solve this. I know it will be simple if I can just see it. Thanx.
    A sample of 500g of radioactive lead 210 decays to polonium 210 acording to the function defined by A(t)= 500e^-.32t,t is for time in years. find the amount of the sample remaining after 4 years. There is more but I think I can find it if I have this part. Thanx
    A(t) gives the amount of lead remaining after t years, so just evaluate A(4).
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  3. #3
    GAMMA Mathematics
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    Quote Originally Posted by whiteowl View Post
    I am lost. Please help me solve this. I know it will be simple if I can just see it. Thanx.
    A sample of 500g of radioactive lead 210 decays to polonium 210 acording to the function defined by A(t)= 500e^-.32t,t is for time in years. find the amount of the sample remaining after 4 years. There is more but I think I can find it if I have this part. Thanx
    This is an application of the "Plug and Chug" Theorem!

    A(4) = 500*e^{-0.32*4} \Rightarrow 139.02
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  4. #4
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    Thanx for the help. I finnally figured out how to plug it in to the calculator. I did not know how to plug in e. Agian thanx
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