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3. The formula for exponential decay is A = Apekt (a) fermium-253 has a half-life of 3 days. Find the value of k in a

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3. The formula for exponential decay is A = Apekt (a) fermium-253 has a half-life of 3 days. Find the value of k in a model of exponential decay for fermium-253. (b) A model for the amount of californiam-248 after t days is A = Age .00207t. How many days will it take for 90% of an initial sample to remain

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