Imagine that a radioactive substance decays at a rate of 0.2% per year. Round all answers to 2 decimal places. a. Find the half-life of the substance. The half-life is ____?____ years. b. How long will it take for three-fourths of a sample of the substance to decay? Answer: ____?____ years. For seven-eighths of the sample? Answer: ____?____

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