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The radioactive isotope thorium 234 has a half-life of approximately 578 hours. (a) If a sample has a mass of 68 milligrams, find an expression

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The radioactive isotope thorium 234 has a half-life of approximately 578 hours. (a) If a sample has a mass of 68 milligrams, find an expression for the mass after t hours. Q(t) = (b) How much will remain after 65 hours? (Round your answer to one decimal place.) mg (c) When will the initial mass decay to 12 milligrams? (Round your answer to one decimal place.) hr

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