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Every radioactive isotope decays at a certain rate It is never known when a given nucleus will decay but if many nuclei are gathered together, as a group they will decay at a measurable and consistent rate. A radioactive half-life is the time it will take for half of the nuclei to decay Part A Phosphorus-32 has a half-le of 140 days Starting with 800 g of P. how many grams will remain after 98.0 days 7 Express your answer numerically in grams. >View Available Hint(s) VAZO Submit 4 A ? C Carbon-14 has a half-life of 5730 years. In a plant fossil, you find that the 4C has decayed to 1/32.0 of the original amount. How long ago was this plant alive? Express your answer numerically in years. View Available Hint(s) VE Submit PAC years