The percentage of alcohol in a person's bloodstream t hr after drinking 8 fluid oz of whiskey is given by

Mathematics For Machine Technology
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Author:Peterson, John.
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Chapter24: Percent Practical Applications
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Problem 33A: The average percent defective product of a manufacturing plant is 1.20%. On a particular day 50...
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Blood Alcohol Level

The percentage of alcohol in a person's bloodstream t hr after drinking 8 fluid oz of whiskey is given by
 
A(t) = 0.23te−0.4t    (0 ≤ t ≤ 12).†
 
(a) What is the percentage of alcohol in a person's bloodstream after 1/2 hr? (Round your answers to three decimal places.)
 
_______ and after 7 hr? _________
 
(b) How fast is the percentage of alcohol in a person's bloodstream changing after 
 
1/2 hr? (Round your answers to three decimal places.)
 
_______ and after 7hr? __________
 
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