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Archeologist can determine the age of artifacts made of wood or bone by measuring the amount of the radioactive isotope 14-C present in the object. The amount of isotope decreases in a first-order process. If 23.1% of the original amount of 14-C is present in a wooden tool at the time of analysis, what is the age of the tool? The half-life of14-C is 5,730 yr. Give your answer in scientific notation.