Intermediate Algebra

19th Edition

ISBN: 9780998625720

Author: Lynn Marecek

Publisher: OpenStax College

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Question

The half-life of a medication prescribed by a doctor is 6 hours. How many mg of this medication is left after 78 hours if the doctor prescribed 100 mg?

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The half-life of radioactive iodine is 60 days. How much of a 50 mg sample will be left in 40 days?

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A substance has a half-life of 2.045 minutes. If the initial amount of the substance was 132.8 grams, how many half-lives will have passed before the substance decays to 8.3 grams? What is the total time of decay?

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For every 1 kilogram (kg) of a child’s weight, pediatricians prescribe 15 milligrams (mg) of a fever reducer. If Isabella weighs 12 kg, how many milligrams of the fever reducer will the pediatrician prescribe?

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A marketing company surveys 1,200 people. They surveyed twice as many females as males. How many males and females did they survey?

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A pitcher of water at 40 degrees Fahrenheit is placed into a 70 degree room. One hour later, the temperature has risen to 45 degrees. How long will it take for the temperature to rise to 60 degrees?

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