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A 40 gram sample of a substance that's used for drug research has a k-value of 0.1472. N = Noe -kt No = initial mass (at time t = 0) N = mass at time t k = a positive constant that depends on the substance
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A 40 gram sample of a substance that's used for drug research has a k-value of 0.1472. N = Noe -kt No = initial mass (at time t = 0) N = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days

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