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Thread: 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 $\displaystyle y(t)$ from 2005 to 2007 is given by: $\displaystyle y_{avg}(t) = \frac {y(7) - y(5)}{7 - 5}$

    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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