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Certain radioactive material decays at a rate proportional to the amount present. If you currently have...

Certain radioactive material decays at a rate proportional to the amount present. If you currently have 300 gr of the material and after 2 years it is observed that 14% of the original mass has disintegrated, find:

a) An expression for the quantity of material at time t.
b) The time necessary for 30 percent to have disintegrated.

Math   Calculus   
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