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  3. a certain substance has a half-life of 4 minutes.

A certain substance has a half-life of 4 minutes. A fresh sample of the substanceweighing...

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A certain substance has a half-life of 4 minutes. A fresh sample of the substanceweighing 90 mg was obtained. After how many minutes will there be 23 mg of thesubstance remaining?1.9 minutes7.9 minutes5.5 minutes31.6 minutes

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