A certain substance has a half-life of 4 minutes. A fresh sample of the substance weighing 90 mg was obtained. After how many

Question

A certain substance has a half-life of 4 minutes. A fresh sample of the substance
weighing 90 mg was obtained. After how many minutes will there be 23 mg of the
substance remaining?
1.9 minutes
7.9 minutes
5.5 minutes
31.6 minutes

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