Question: Problems 5261. The purpose of these problems is to keep the material fresh in your mind so that you are better prepared for later sections,

Problems 52–61. The purpose of these problems is to keep the material fresh in your mind so that you are better prepared for later sections, a final exam, or subsequent courses such as calculus.

A radioactive substance has a half-life of 15 years. How long until there is 40% of a sample remaining?

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