SOLUTION: a certain element has a half-life of 15 years. if there was 1200mg originally, find the remaining amount after 5 years/

Question 953715: a certain element has a half-life of 15 years. if there was 1200mg originally, find the remaining amount after 5 years/
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
General Model,

, skipping over a step;

Take two separate directions from that step:

and .

The half-life data will give you k;
the decay situation data will give you y using the general model formula.

(Sometimes students want to be able to calculate half-life using other given data, so that is why the formula for t).
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