A certain radioactive material known to decay at a rate proportional to the amount present. If initially there is 50 milligrams of the material present and after two hours it is observed that the...

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Extracted text: A certain radioactive material known to decay at a rate proportional to the amount present. If initially there is 50 milligrams of the material present and after two hours it is observed that the material has lost 10 percent of its original mass, find an expression for the mass of the material remaining at t=5 hours. Select the correct response: 36.38 mg 38.36 mg 42.65 mg None