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fQuestion 4 (5 points) A radioactive substance decays from 16 g to 12.5 g in 5 years. What is the half life of this substance?

\fQuestion 4 (5 points) A radioactive substance decays from 16 g to 12.5 g in 5 years. What is the half life of this substance? Round your answer to the nearest whole number

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