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The half-life of a certain radioactive substance is 2.5 years. (a) What is the value of the exponential decay constant, k? Round your answer to

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The half-life of a certain radioactive substance is 2.5 years. (a) What is the value of the exponential decay constant, k? Round your answer to 3 places after the decimal point, if necessary. K = -0.277 (b) If 325 grams is present initially, how much will be present in 8.3 years? Round your answer to 3 places after the decimal point, if necessary. Number of grams after 8.3 years = 246.340 X

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