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Unit 2 AP Precalculus Practice Test 2026

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A scientist studying bacteria growth notices interesting behavior with the replication of cells over the course of 24 hours. She records her description of the behavior in hopes of writing a function that can be used to make predictions for future bacteria growth. She observed that for the first 8 hours, the number of bacteria, y, increases at a constant rate of 10 cells per minute. After the initial 8 hours, the number of bacteria varies inversely with time, x, with a proportional constant of 3 for the next 10 hours. Between hour 18 through hour 20, the bacteria decrease at a constant rate of 5 cells per minute. In the last 4 hours, the bacteria double in growth every minute. Which of the following models best fits the scientist’s observations?
Correct Answer:
(A)
Explanation:
Correct answer: (A)

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