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Mr. Greene likes to drink a cup of green tea every morning. One cup has about 35 mg of caffeine in it, and the amount of caffeine left in the bloodstream decreases by 23% every hour.
a.) Write a function that models the situation.
b.) How much caffeine will be in his system after 4 hours?
c.) BONUS: Approximately how long will it take for there to be only 5 mg of caffeine left

Respuesta :

A. Y=k*x
K=23/100=0.23
Y=0.23*x (x is time by an hour)

B. X=4
Y= 0.23*4 = 0.92 mg

C. 5 = 0.23*x
5/0.23= 21.7 hour

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