The rate of decay of a radioactive substance is proportional to the amount of the substance present. Three years ago there was 6 grams of substance. Now there is 5 grams. How many grams will there be 3 years from now? 1.(a) Please write an equation for the relationship of the rate of decay of a radioactive substance being proportional to the amount of the substance present. 2.From (a), derive a solution of this equation as the model for radioactive decay. 3.Solve (b) to obtain the answer to the problem.

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The rate of decay of a radioactive substance is proportional to the amount of the substance present.
Three years ago there was 6 grams of substance. Now there is 5 grams. How many grams will there be 3 years from now?

1.(a) Please write an equation for the relationship of the rate of decay of a radioactive substance being proportional to the amount of the substance present.

2.From (a), derive a solution of this equation as the model for radioactive decay.

3.Solve (b) to obtain the answer to the problem.

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