SOLUTION: A radioactive substance is known to decay according to the continuous expo-nential model Q(t) = Q0e^rt. The rate of change, , for the particular substance is -0.128, when
t is mea
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Question 597184: A radioactive substance is known to decay according to the continuous expo-nential model Q(t) = Q0e^rt. The rate of change, , for the particular substance is -0.128, when
t is measured in years. What percentage (to the nearest :01%) of the original amount of the
substance is left after 5 years?
NOTE: Q(t) = Q0e^rt Q0 ITS Q AND THE ZERO IS IN THE BOTTOM LIKE IN LOG FORM
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
\ =\ Q_0e^{rt})
The proportion left after 
years at a given decay rate 
would be:
}{Q_0}\ =\ e^{rt})
So the percentage would be
}{Q_0}\ =\ 100\,\cdot\,e^{rt})
Just plug in the numbers for 
and 
then do the arithmetic. Round appropriately at the end of your calculations.
John
My calculator said it, I believe it, that settles it
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