Trigonometry (MindTap Course List)
Trigonometry (MindTap Course List)
10th Edition
ISBN: 9781337278461
Author: Ron Larson
Publisher: Cengage Learning
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Please help on all asked questions. Please show all work and steps. Please circle the final answer. Please avoid using any calculus when solving please.

2. Various radioactive substances are used in medical tests. a. lodine-131 is used in thyroid tests. A 20-mg sample decays to 16.85 mg in 48 hours. What is the half-life of iodine-131, rounded to the nearest hour? b. Strontium-87 is used in some bone tests. After 1 hour, a 100-mg sample decays to 78.1 mg. Determine the half-life of strontium-87, rounded to the nearest tenth of an hour. c. A different radioactive substance has an initial mass of 50 mg and a half-life of 10 hours. How much of the substance will remain after 30 hours? Provide your answer to the nearest hundredth of a milligram.
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Transcribed Image Text:2. Various radioactive substances are used in medical tests. a. lodine-131 is used in thyroid tests. A 20-mg sample decays to 16.85 mg in 48 hours. What is the half-life of iodine-131, rounded to the nearest hour? b. Strontium-87 is used in some bone tests. After 1 hour, a 100-mg sample decays to 78.1 mg. Determine the half-life of strontium-87, rounded to the nearest tenth of an hour. c. A different radioactive substance has an initial mass of 50 mg and a half-life of 10 hours. How much of the substance will remain after 30 hours? Provide your answer to the nearest hundredth of a milligram.
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