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In July of 1999, an individual bought several leaded containers from a metals recycler and found two of them labeled "radioactive." An investigation showed that the containers, originally obtained from Ohio State University, apparently had been used to store iodine-131 starting in January of 1999. Because iodine-131 has a half-life of only 8 days, no elevated radiation levels were detected.† Suppose 9 grams of iodine-131 is stored in January. The mass y (in grams) that remains after t days is given by y = 912t/8, t ≥ 0. How much of the substance is left in July, after 160 days have passed?

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(Top Tutor) Daniel C.
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