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03-07-2017
Mathematics

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a 9 gram sample of a substance that's used for drug research has a k-value of 0.1459

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09-07-2017

N = N0 e^(-kt)

for half life N/N0 = 1/2 and k = 0.1459

1/2 = e^(-0.1459t)

=> -0.1459 t = ln(0.5)

t = - ln(0.5) /0.1459

= 4.8 days

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