Radium (Ra-225) has a half-life of 15 days. For a 100 g sample, the amount of radioactive material remaining, A, after time t, is given by the equation A(t) = 100(0.5), where A is measured in grams and t is measured in days. a. Find the average rate of change from 3 days to 4 days, rounded to one decimal place. b. Approximate the average rate of change at t = 3 days, rounded to one decimal place.

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