Question: A certain radioactive material is known to decay at a rate proportional to the amount present. Over a 50-year period, an initial amount of 100

A certain radioactive material is known to decay at a rate proportional to the amount present. Over a 50-year period, an initial amount of 100 grams has decayed to only 75 grams. Find an expression for the amount of material r years after the initial measurement. Calculate the half-life of the material.

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