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6. Radioactive substances decay at a rate proportional to their remaining mass M. a] Express this rate of decayr as a differential equation. 11] When a ling organism dies it ceases to replace the carbon isotope (2-14, and the [2-14 that is present decays with a halflife of about ETED years. If archeologists discover a fossilized bone that has BD'H: of the (1-14- of a live bone, approximately how old is it