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A certain substance has a half-life of 2 minutes. A fresh sample of the substance weighing 60 mg was obtained. After how many minutes will

A certain substance has a half-life of 2 minutes. A fresh sample of the substance weighing 60 mg was obtained. After how many minutes will there be 14 mg of the substance remaining?4.6 minutes8.4 minutes2.5 minutes4.2 minutes

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