A typical cup of coffee contains about 82 mg of caffeine and every hour approximately 19% is metabolized and eliminated.

Write the definition of a function named k that expresses the amount of caffeine in the body in mg as a function of t, the number of hours since the coffee was consumed.

How much caffeine is in the body after 7 hours?
mg
A 80 mg of a vaccine is given to a patient to prevent measles. The vaccine leaves the body at a rate of 4.8% per hour.

Define a function g that gives the mass of the vaccine remaining in the body, V, in terms of the number of hours, n since the vaccine was administered.
How much of the vaccine remains in the body 24 hours after it was administered?
mg

Use your graphing calculator to determine how many hours passed before there were only 5mg of the vaccine remaining in the body.
hours
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