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Math Help - radioactive

  1. #1
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    radioactive

    The amount of a radioactive preporation y mg decreases by the formula
    y=80*0.5^0.2t where t is the time in years after the start of 2000, what is the average rate of change between the start of 2005 and the start of 2007

    I know am suppose to put the years into the calculation some place but from there am lost
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by JBswe View Post
    The amount of a radioactive preporation y mg decreases by the formula
    y=80*0.5^0.2t where t is the time in years after the start of 2000, what is the average rate of change between the start of 2005 and the start of 2007

    I know am suppose to put the years into the calculation some place but from there am lost
    the average rate of change for y(t) from 2005 to 2007 is given by: y_{avg}(t) = \frac {y(7) - y(5)}{7 - 5}

    can you continue?
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  3. #3
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    ok tryed to work it , is the answer 10.31mg?
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by JBswe View Post
    ok tryed to work it , is the answer 10.31mg?
    i got a negative answer (which you should, since the sample is decreasing)
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