PSAT Math Grid-Ins Question 95: Answer and Explanation
Question: 95
Doctors use the function shown above to calculate the concentration, in parts per million, of a certain drug in a patient's bloodstream after t hours. How many more parts per million of the drug are in the bloodstream after 20 hours than after 10 hours?
Correct Answer: 5
Explanation:
5
Difficulty: Medium
Getting to the Answer: Evaluate the function at t = 20 and at t = 10, then subtract the results. Make sure you follow the correct order of operations as you simplify:
The question asks how many more parts per million are in a patient's bloodstream after 20 hours than after 10 hours, so subtract 22 - 17 = 5. Grid in 5.
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