If (100.0 mathrm{mg}) of neptunium-239 (left({ }^{239} mathrm{~Np}ight)) decays to (73.36 mathrm{mg}) after 24 hours, find the
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If \(100.0 \mathrm{mg}\) of neptunium-239 \(\left({ }^{239} \mathrm{~Np}ight)\) decays to \(73.36 \mathrm{mg}\) after 24 hours, find the value of \(r\) in the growth/decay formula for \(t\) expressed in days.
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