Applications of Differential Equations A certain radioactive material is known to decay at a rate proportional to the amount present. If initially there are 100milligrams of the material present and after two years it is observed that 5% of the original mass has decayed. Find the time necessary for the 10% of the original mass have decayed. 4.05 O 5.04 O 4.5 O 5.4 none of the choices

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