When an antibiotic is introduced into a culture of 20,000 bacteria, the number of bacteria decreases exponentially. After 12 hours, there are only 5000 bacteria left. (a) Write an exponential equation to express the growth func-tion y in terms of time t in hours.(b) In how many hours will half the number of bacteria remain?
Unitary Method
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Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
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When an antibiotic is introduced into a culture of 20,000 bacteria, the number of bacteria decreases exponentially. After 12 hours, there are only 5000 bacteria left.
(a) Write an exponential equation to express the growth func-
tion y in terms of time t in hours.
(b) In how many hours will half the number of bacteria remain?
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