Question: This is Differential Equations problem.Provide clean and clear solutions thank you. 2. A certain radioactive material is known to decay at a rate proportional to

This is Differential Equations problem.Provide clean and clear solutions thank you.

2. A certain radioactive material is known to decay at a rate proportional to the amount present. If initially there are 170 milligrams of the material present and if after two years, it is observed that 10% of the original mass has decayed, find (a) an expression for the mass at any time t and (b) the time necessary for 35% of the original mass to have decayed

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