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) About Me  (Show Source):
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The proportion left after years at a given decay rate would be:



So the percentage would be



Just plug in the numbers for and then do the arithmetic. Round appropriately at the end of your calculations.

John

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