AP微积分BC 2018年真题 附答案和评分标准 AP Calculus BC 2018 Real Exam with Answers and Scoring Guidelines.pdf

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2018

AP Calculus BC

Free-Response Questions

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AP Central is the official online home for the AP Program: apcentral.collegeboard.org. ® 2018 AP CALCULUS BC FREE-RESPONSE QUESTIONS CALCULUS BC SECTION II, Part A Time—30 minutes Number of questions—2 A GRAPHING CALCULATOR IS REQUIRED FOR THESE QUESTIONS.

1. People enter a line for an escalator at a rate modeled by the function r given by ⎧ ⎪ 3 7 ⎪ t t ⎪⎪44 1 − for 0 £ t £ 300 r()t ⎨ ( )( ) 100 300 ⎪ ⎪ ⎪⎪⎩0 for t > 300, where r()t is measured in people per second and t is measured in seconds. As people get on the escalator, they exit th

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