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roblem 2: An isotope of sodium has a half-life of 15 hours. A sample of this isotope has an initial mass of 2 g.

roblem 2: An isotope of sodium has a half-life of 15 hours. A sample of this isotope has an initial mass of 2 g. a. Write an exponential function that models the amount remaining after t hours. b. Estimate the amount remaining after 4 hours. c. Estimate the time required for the mass to be reduced to 0.01 g.

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