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CALCULUS AB FREE-RESPONSE QUESTIONS CALCULUS AB 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 ⎧ ⎪ t t. 3 7 ⎪⎪ 44 1 for 0 ££ t ⎪ ()(rt ()=⎨ 100 300− ) 300 ...

2017 question 2 a: During the time interval 0 < t < 4.5 hours, water flows into tank A at a rate of a (t)= (2t-5) + 5e^2 sin t liters per hour. During the same time interval, water flows into tank B at a rate of b (t) liters per hour. Both tanks are empty at time t = 0. The graphs of y = a (t) and y = b (t), shown in the figure above, intersect ...Jan 29, 2024 · We can analyze the average AP® Calculus BC score more efficiently by considering a multi-year trend. We can refer to the AP® Student Score Distributions, released by the College Board annually. These reports show us that the mean score was 3.81 in 2014, 3.72 in 2015, 3.80 in 2016, 3.78 in 2017, 3.74 in 2018, 3.80 in 2019 and 3.84 in 2020. AP Calculus 2018 BC FRQ Solutions Louis A. Talman, Ph.D. Emeritus Professor of Mathematics Metropolitan State University of Denver May 22, 2018 1 Problem 1 1.1 Part a During the time interval 0 t 300, Z 300 0 r(t)dt= 44 Z 300 0 t 100 3 1 t 300 7 dt= 270 (1) people enter the line for the escalator. (Fortunately, the problem is calculator active ... CALCULUS BC FREE-RESPONSE QUESTIONS CALCULUS BC SECTION II, Part B NO CALCULATOR IS ALLOWED FOR THESE QUESTIONS. 3. The function f is differentiable on the closed interval [−6, 5 ] and satisfies f (− ) 2 = 7. The graph of f ¢, the derivative of f, consists of a semicircle and three line segments, as shown in the figure above. AP Calculus AB Exam 2018 Free Response Question #2Particle motion along the x-axis problem. Given velocity. Find derivative at a point, acceleration, using...AP Calculus BC Exam 2018 Free Response Question #6Series question! Creating a new series from a given series (composition and multiplying by x). Interval o...3 AP® CALCULUS AB/CALCULUS BC 2017 SCORING GUIDELINES Question 4 (a) H′(0 )− = 1 4 (91 16−27 )− =H ( )0 =91 An equation for the tangent line is y =91 −16 . t The internal temperature of the potato at time t =3 minutes is2016 AP Calculus BC Practice Exam MCQ Multiple Choice Questions with Answers Advanced Placement.pdf ... 1989-1997 AP Calculus AB and BC Old FRQ with Solutions Advanced Placement.pdf | Plain Text ... in 1993 and 1994. • Graphing calculators have been required on the AP Calculus Exams since 1995. From 1995-1999, the calculator …

CALCULUS BC SECTION II, Part A. A graphing calculator is required for some problems or parts of problems. 1. Let R be the shaded region bounded by the graph of y = ln x and the line y = x - 2, as shown above. Find the volume of the solid generated when R is rotated about the horizontal line y = - 3.AP Calculus Free-Response Solutions and Notes. Question AB-1. ( 30 ) − A ( 0 ) The average rate of change is. 30 − 0. ≈ − 0.197 pounds per day. (b) A′ ( 15 ) ≈ − 0.164 pounds per day. On day 15, the amount of grass clippings remaining in the bin is decreasing at the rate of 0.164 pounds per day. 30 (c) The average amount of grass ...Created Date: 5/2/2018 3:26:17 PM28-May-2016 ... Solutions. All on one page, written in the way that will receive full credit, with each key decision explained.Download free-response questions from past exams along with scoring guidelines, sample responses from exam takers, and scoring distributions. If you are using assistive technology and need help accessing these PDFs in another format, contact Services for Students with Disabilities at 212-713-8333 or by email at [email protected]. The ...

AP Calculus BC 2015, 2016 Released BC Only FRQ . 6. The Maclaurin series for a function f is given by 32 (-3)n-l and converges to f(x) for I xl < R, where R is the radius of convergence of the Maclaurin series. (a) Use the ratio test to find R.AP® Calculus official past exam paper questions grouped via difficulty level and topic for AB and BC. NEW Hiring - A Level Maths students (predicted an A*) or Further Maths students (predicted an A or A* ) to type solutions for worksheets & other resources (also looking for students with very neat handwriting for written past paper model ...2. Let f and g be the functions defined by f x 1 x ex 2 x and g x x 4 6.5 x 2 6 x 2. Let R and S be the two regions enclosed by the graphs of f and g shown in the figure above. Region S is the base of a solid whose cross sections perpendicular to the x-axis are squares. Find the volume of the solid.The following comments on the 2017 free-response questions for AP® Calculus AB and Calculus BC were written by the Chief Reader, Stephen Davis of Davidson College. They give an overview of each free-response question and of how students performed on the question, including typical student errors. General comments regarding the skills and ...2016 AP Calculus AB Exam Free Response Question #2Motion along a straight line. Speed. Change of direction from velocity function. Position using Fundamen...

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Questions and Worked Solutions for AP Calculus BC 2016. AP Calculus BC 2016 Free Response Questions - Complete Paper (PDF) AP Calculus BC 2016 Free Response …2016 AP Calculus AB & AP Calculus BC Exam Free Response Question #1Typical rate in/rate out problem. Approximate a derivative. Use a left Riemann sum and d...AP® Calculus AB 2016 Scoring Guidelines Author: College Board Subject: AP; Advanced Placement; 2016 AP Exam Administration Keywords: AP; Advanced Placement; 2016 AP Exam Administration; scoring information; scoring resources; student samples; chief reader reports; exam data; exam information; exam preparation; teacher resources; ADA-compliantValues of f ′ , the = ( ) = derivative of f, are given for selected values of x in the table above. (a) Write an equation for the line tangent to the graph of f at x 1. Use this line to approximate f 1.4 . = ( ) (b) Use a midpoint Riemann sum with two subintervals of equal length and values from the table to. 1.4 1.4.Created Date: 5/29/2018 3:49:20 PMAP® Calculus BC 1999 Scoring Guidelines. The materials included in these files are intended for non-commercial use by AP teachers for course and exam preparation; permission for any other use must be sought from the Advanced Placement Program. Teachers may reproduce them, in whole or in part, in limited quantities, for face-to-face teaching ...

Write your responses to this question only on the designated pages in the separate Free Response booklet. Write your solution to each part in the space provided for that part. 2. A particle moving along a curve in the xy-plane is at position ( x ( t ) , y ( t ) ) at time t 0 . The particle moves in.Justify your answer. Show Step-by-step Solutions. AP Calculus BC 2018 Free Response Question 2. Integrating a density function. This was a kind of new context but all the same old stuff. Also, you had a calculator to do the hard work for you. Approximating a derivative at a point. Integrating density to get a total.Sha. 28, 1439 AH ... In 2016 FRQ 2, given the graph of a parametric particle, we determine the position, slope, speed at a given time, and the total distance ...About the Exam. The AP Calculus BC Exam will test your understanding of the mathematical concepts covered in the course units, as well as your ability to determine the proper formulas and procedures to use to solve problems and communicate your work with the correct notations. A graphing calculator is permitted for parts of the exam.From the same inquisitive mind that brought us the sandwich price calculator comes another elegant, eye-opening tool to determine the real cost of cocktails Punch in your poison an...Question 6 (continued) 1. in the second line by presenting the limit (with or without absolute values) lim 2 e n 3 . The response earned the. n 1 en second point by correctly evaluating the limit resulting in 1, referencing that 1 0 , and presenting a correct. 2 2 conclusion in the lower right.Justify your answer. Show Step-by-step Solutions. AP Calculus BC 2018 Free Response Question 2. Integrating a density function. This was a kind of new context but all the same old stuff. Also, you had a calculator to do the hard work for you. Approximating a derivative at a point. Integrating density to get a total.Questions and Worked Solutions for AP Calculus BC 2016. AP Calculus BC 2016 Free Response Questions - Complete Paper (PDF) AP Calculus BC 2016 Free Response …Write your responses to this question only on the designated pages in the separate Free Response. booklet. Write your solution to each part in the space provided for that part. A particle, P, is moving along the x-axis. The velocity of particle P at time t is given by v t P () = sin t1.5. for 0 £ t £ p . R(0) [1 0] + R(1) [3 1] + R(3) [6 3] + R(6) [8 6] = (2) The function R is decreasing, so the left-hand endpoint of each subinterval gives the max-imum value of R on that subinterval. Thus, a left-hand Riemann sum gives an overesti-mate of the integral. Scoring notes: The first point is earned for a definite integral, with or without 1 1 1 or 3. 4 −. A response that presents a definite integral with incorrect limits but a correct integrand …Justify your answer. Show Step-by-step Solutions. AP Calculus BC 2018 Free Response Question 2. Integrating a density function. This was a kind of new context but all the same old stuff. Also, you had a calculator to do the hard work for you. Approximating a derivative at a point. Integrating density to get a total.

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Question 6 (continued) 1. in the second line by presenting the limit (with or without absolute values) lim 2 e n 3 . The response earned the. n 1 en second point by correctly evaluating the limit resulting in 1, referencing that 1 0 , and presenting a …AP Calculus BC 2016 Free Response Questions - Complete Paper (pdf) AP Calculus AB and BC 2016 Free Response Question 1. Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.This calculator is based on the 2015 released exam with the latest scoring guidelines, such as these. Your score on the grading curve: 0% 12.5% 25% 37.5% 50%. Why is my grade curved? CALC BC free response ap calculus new frq module approximating values and functions an airplane takes off along straight runway. for 20, the velocity is given mr. calculus 2017 released free response solutions ab/bc 1 ab 2 ab/bc 3 ab/bc 4 ab 5 ab 6 bc 2 bc 5 bc 6. back to mr calculus ...AP Calculus BC 2000 Scoring Guidelines. The materials included in these files are intended for non-commercial use by AP teachers for course and exam preparation; permission for any other use must be sought from the Advanced Placement Program. Teachers may reproduce them, in whole or in part, in limited quantities, for face-to-face teaching ...In this video we go over the specific parts of FRQs from the AP Calculus AB exam since 2007 that my students (and youtube commenters) have found the most cha...AP Calculus BC Practice Exam From the 2 016 Administration This exam ma y no t be posted on school or persona l websites , no r electronically redistribute d fo r an y reason . Thi s Released Exa m is provided by th e Colleg e Boar d for AP Exam preparation . Teacher s ar e permitted to download th e material s an d mak e copies to use wit h thei r student s in a classroo m settin g onl y. To ...Solution: At time days, the number of fish in the bay is decreasing at a rate of 30 fish per day. Part B Note: Sign charts are a useful tool to investigate and summarize the behavior of a function. By itself a sign chart for or is not a sufficient response for a justification.Dr. Debra Rose Wilson is a professor, researcher, and holistic healthcare practitioner. She teaches graduate-level psychology and nursing courses. Dr. Wilson has over 200 publicati...

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Calculus BC Practice Exam From the 2016 Administration This exam may not be posted on school or personal websites, nor ... Free-Response Questions Multiple-Choice Answer Key Free-Response Scoring Guidelines Scoring Worksheets Question Descriptors and Performance Data Note: This publication shows the page numbers that appeared in the 2015 − 16 ...CALCULUS BC FREE-RESPONSE QUESTIONS. The graphs of the polar curves r = 4 and r = 3 + 2 cos. p 5p. at q = and q = . 3 3. (a) Let R be the shaded region that is inside the …AP Calculus 2021 BC FRQ Solutions Louis A. Talman, Ph.D. Emeritus Professor of Mathematics Metropolitan State University of Denver May 12, 2021 1. Solution: We begin by writing r 0 = 0, r 1 = 1, r 2 = 2, r 3 = 2:5, and r 4 = 4. (a) To approximate f0(2:25) from the given data, we write f0(2:25) ˘ f(2:5) f(2:0) 2:5 2:0 = 10 6 2:5 2:0 = 4 0:5 = 8 ...CALCULUS BC SECTION II, Part A. Time—30 minutes Number of problems—2. A graphing calculator is required for these problems. 1. At time t, a particle moving in the xy-plane is at position ( x ( t ) , y ( t ) ) , where x ( t ) and y ( t ) are not explicitly ≥ dx = + dy given. For t 0, 4 t 1 and = sin ( t 2 ) .2021 AP Calculus BC Exam Free Response Question #2Full playlist: https://www.youtube.com/playlist?list=PL6iwkLfBjZixEcq-THVfosREeDizd1nK5Parametric, vector p...2012 AP Calculus AB Exam #2.Topics: Area, volume with known cross sections, dividing a region in two, integrating with respect to y (dy)back to mr calculus. mr. calculus 2018 released free response solutions ab/bc 1 ab 2 bc 2The AP Calculus BC paper consists of 2 sections and the format is exactly the same as for the AB exam: Section I multiple choice - 45 questions | 105 minutes | worth 50% of the exam score. Part A: 28 questions, 55 minutes (non calculator) Part B: 17 questions, 50 minutes (calculator) Section II free response - 6 questions | 90 minutes | worth ...2016 Ap Calculus Frq Acing AP Calculus AB and BC AP Calculus Premium David Bock 2020-07-14 Always study with the most up-to-date prep! Look for AP Calculus Premium, 2022-2023, ISBN 9781506263946, on sale January 4, 2022. Publisher's Note: Products purchased from third-party sellers are not guaranteed by the publisher for quality, authenticity, orAP ClassroomIn part (d) the response earned the point by providing the correct answer. AP. Calculus BC 2021 Scoring Commentary. Question 6 (continued) Sample: 6C Score: 3. The response earned 3 points: 1 point in part (a), 1 point in part (b), 1 point in part (c), and no points in part (d). In part (a) the response did not earn the first point because the ...AP Calculus BC Scoring Guidelines from the 2019 Exam Administration Author: College Board Subject: AP Calculus AB Scoring Guidelines from the 2019 Exam Administration Keywords: ….

AP ClassroomA correct. response will find the slope of the tangent line when t = 0 is dM = 35 and then use the tangent line equation, dt t = 0 4. y = 5 + 35 ( ) ≈ 4 t , to find that M 2 22.5. In part (c) students were asked to find an expression for d M 2 2 in terms of M and then to use d M to reason dt 2 dt 2.f, are given for selected values of xin the table above. (a) Write an equation for the line tangent to the graph of fat x= 1. Use this line to approximate f()1.4 . (b) Use a midpoint Riemann sum with two subintervals of equal length and values from the table to approximate () 1.4 1. f′xdx. Visit the College Board on the Web: www.collegeboard.org. AP Central is the oficial online home for the AP Program: apcentral.collegeboard.org. 1. 300 (a) ∫ r ( t ) dt = 270. 0. According to the model, 270 people enter the line for the escalator during the time interval 0 ≤ t ≤ 300. (b) 20 + ∫ ( 300 ( 300. Scoring Worksheets. The following provides scoring worksheets and conversion tables. used for calculating a composite score of the exam. 2017 AP Calculus BC Scoring Worksheet. Section I: Multiple Choice. Number Correct. (out of 45) × 1.2000 =. Weighted Section I Score.FREE-RESPONSE SOLUTIONS ~ 2015 AB 7 Question AB-5 (a) f has a relative maximum at x = -2, because f ′(x) changes sign from positive to negative there. (b) For the graph of f to be concave down, f ′ must be decreasing. For f to be decreasing, f ′ must be negative. These two conditions together are met on the intervals −<<−21x and 13<x < . (c) The graph of f has points of inflection ...2016 AP Calculus AB & AP Calculus BC Exam Free Response Question #1Typical rate in/rate out problem. Approximate a derivative. Use a left Riemann sum and d...AP Calculus BC Practice Exam From the 2 016 Administration This exam ma y no t be posted on school or persona l websites , no r electronically redistribute d fo r an y reason . Thi s Released Exa m is provided by th e Colleg e Boar d for AP Exam preparation . Teacher s ar e permitted to download th e material s an d mak e copies to use wit h thei … 2016 bc calc frq, AP® CALCULUS AB/CALCULUS BC 2015 SCORING GUIDELINES. feet per hour, t is measured in hours, and 0 ≤ t ≤ 8. The pipe is partially blocked, allowing water to drain out the other end of the pipe at a rate modeled by D ( t ) = − 0.04 t 3 + 0.4 t 2 + 0.96 t cubic feet per hour, for 0 ≤ t ≤ 8. There are 30 cubic feet of water in the pipe ..., back to mr calculus. mr. calculus 2018 released free response solutions ab/bc 1 ab 2 bc 2, 30, is a better model for the amount of grass. clippings remaining in the bin. Use. L t. to predict the time at which there will be 0.5 pound of grass. clippings remaining in the bin. Show the work that leads to your answer. 2014 AP. …, 2016 AP Calculus BC Free Response Question #2, AP® Calculus BC 2004 Scoring Guidelines. The materials included in these files are intended for noncommercial use by AP teachers for course and exam preparation; permission for any other use must be sought from the Advanced Placement Program®. Teachers may reproduce them, in whole or in part, in limited quantities, for face-to-face teaching ..., AP® Calculus BC 2003 Free-Response Questions. The materials included in these files are intended for use by AP teachers for course and exam preparation; permission for any other use must be sought from the Advanced Placement Program®. Teachers may reproduce them, in whole or in part, in limited quantities for noncommercial, face-to-face ..., Sample: 3C. Score: 3. The response earned 3 points: no points in part (a), no points in part (b), 2 points in part (c), and 1 point in part. (d). In part (a) the property of definite integrals that is required is not stated, so the first point was not earned., AP Calculus BC 2016 Free Response Questions - Complete Paper (pdf) AP Calculus BC 2016 Free Response Question 4. Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations., AP Calculus 2019 BC FRQ Solutions. Louis A. Talman, Ph.D. Emeritus Professor of Mathematics Metropolitan State University of Denver May 21, 2019. 1 Problem 1. 1.1 Part a. Because sh enter the lake at the rate E(t) = 20+15sin ˇt 6 , with tin hours after midnight, the number, F, of sh that enter the lake over the 5-hour period from t= 0 to t= 5 ..., AP Calculus BC Scoring Guide Unit 9 Progress Check: FRQ Part B Copyright © 2017. The College Board. These materials are part of a College Board program., AP Calculus 2006 BC (Form B) FRQ Solutions Louis A. Talman, Ph.D. Emeritus Professor of Mathematics Metropolitan State University of Denver July 11, 2017 1 Problem 1 1.1 Part a We must first find the intersection nearest the y-axis of the curve y= f(x) with the nega-tive x-axis. In order to do so, we solve the equation 0 = a3 4 a2 3 a 2 ..., 2018 RELEASED FREE RESPONSE SOLUTIONS - MR. CALCULUS. ⇒ H and H' are continuous. or. at t = 6 years. We see that = 2 and we know that since H is differentiable on [2,10] 5− 3 5− 3 then H is continuous on [2,10]. So we know that H is both continuous and differentiable on [3,5]. So, by the Mean Value Theorem, we know that there must be at ..., AP® Calculus BC 2004 Scoring Guidelines. The materials included in these files are intended for noncommercial use by AP teachers for course and exam preparation; permission for any other use must be sought from the Advanced Placement Program®. Teachers may reproduce them, in whole or in part, in limited quantities, for face-to-face teaching ... , The College Board is a mission-driven not-for-profit organization that connects students to college success and opportunity. Founded in 1900, the College Board was created to expand access to higher education. Today, the membership association is made up of over 6,000 of the world’s leading educational institutions and is dedicated to ..., Visit the College Board on the Web: www.collegeboard.org. AP Central is the oficial online home for the AP Program: apcentral.collegeboard.org. 1. 300 (a) ∫ r ( t ) dt = 270. 0. According to the model, 270 people enter the line for the escalator during the time interval 0 ≤ t ≤ 300. (b) 20 + ∫ ( 300 ( 300., AP Calc BC 2019 - MCQ FRQ. MCQ FRQ. Course. Calculus I (MATH 180) 285 Documents. University. University of Illinois at Chicago. Academic year: 2019/2020. Uploaded by:, stevecho816 • 6 yr. ago. Removable discontinuity is basically like a empty circle in a smooth curve. For BC students, the answer was 3 only. Reply. 1. Sith_Lord_Yoda Calc BC (5), Biology (4), Physics C (5), APUSH (5), Calc AB (5), • 6 yr. ago. It asked for a removable discontinuity ( hole) so I think the answer is 2., AP® CALCULUS AB/CALCULUS BC 2015 SCORING GUIDELINES. feet per hour, t is measured in hours, and 0 ≤ t ≤ 8. The pipe is partially blocked, allowing water to drain out the other end of the pipe at a rate modeled by D ( t ) = − 0.04 t 3 + 0.4 t 2 + 0.96 t cubic feet per hour, for 0 ≤ t ≤ 8. There are 30 cubic feet of water in the pipe ..., AP Calculus AB Practice Exam From the 2 016 Administration This exam ma y no t be posted on school or persona l websites , no r electronically redistribute d fo r an y reason . Thi s Released Exa m is provided by th e Colleg e Boar d for AP Exam preparation . Teacher s ar e permitted to download th e material s an d mak e copies to use wit h thei r student s in a classroo m settin g onl y., BC: Get the latest Brunswick stock price and detailed information including BC news, historical charts and realtime prices. Indices Commodities Currencies Stocks, In 2016 FRQ 4, given a differential equation, we find the second derivative, determine if it is a maximum or minimum at a given point, use L'Hopital's rule t..., AP® CALCULUS BC 2019 SCORING GUIDELINES Question 2 (a) 1 r 2 d 3.534292 2 0 The area of S is 3.534. 1 2 : : integral 1 : answer (b) 1 r d 1.579933 0 0 The average distance from the origin to a point on the curve r r for 0 is 1.580 (or 1.579). 1 2 : : integral, 2023 AP Calculus BC Free Response Questions Louis A. Talman, Ph.D. Emeritus Professor of Mathematics Metropolitan State University of Denver May xx, 2023 1. (a) The integral Z 135 60 f(t)dtgives, in gallons, the amount of gas pumped into the gas tank during the time interval 60 t 135. This amount is given by Z 135 60 f(t)dt˘f(90) 30 + f(120 ..., Visit College Board on the web: collegeboard.org. AP® Calculus AB/BC 2021 Scoring Commentary. Question 4 (continued) Sample: 4B Score: 6. The response earned 6 points: 1 global point, 1 point in part (a), 2 points in part (b), 2 points in part (c), and no points in part (d). The global point was earned in part (a) with the statement G x f x ., College Board, A graphing calculator is required for some problems or parts of problems. 20. 1. Let R be the region in the first and second quadrants bounded above by the graph of y = and below. + 2 x by the horizontal line y = 2. Find the area of R. Find the volume of the solid generated when R is rotated about the x-axis., 2022 AP Calculus BC Exam Free Response Question #6Full playlist: https://www.youtube.com/watch?v=9QeJBkrHlxA&list=PL6iwkLfBjZiz7vkRE1eBu9AxhU3fh8XEOseries pr..., Regularly Scheduled Exam Date: ursday morning, May 5, 2016 Late-Testing Exam Date: ursday morning, May 19, 2016 Section I Total Time, Calculus AB: 1 hr. 45 min. Section II Total Time, Calculus AB: 1 hr. 30 min. Section I Total Time, Calculus BC: 1 hr. 45 min. Section II Total Time, Calculus BC: 1 hr. 30 min. Section I Total Time: 1 hour 45 ... , All of their 2021 video solutions can be viewed right here. 2021 AP Calculus BC Free Response Question 1 Solution [Student] You can check out this project from past years here (2019), here (2018), here (2017), and here (2016). Many more Williston student screencasts can be found online right here. Posted in: AP Calculus BC, Calculus, Math News ..., AP Calc BC 2019 Released FRQ Solutions. (a) = 153.457690 To the nearest whole number, 153 fish enter the lake from midnight to 5 A.M. dt = 6.059038 (b) 5-00 The average number of fish that leave the lake per hour from midnight to 5 A.M. is 6.059 fish per hour. (c) The rate of change in the number of fish in the lake at time t is given by E(t ..., 2014 RELEASED FREE RESPONSE SOLUTIONS - MR. CALCULUS 2014 BC #6 (no calculator) (a) Using the Ratio test: lim. n→∞. 2n+1(x−1)n+1. n+1 i. n. 2n(x−1)n., Visit College Board on the web: collegeboard.org. AP® Calculus AB/BC 2023 Scoring Commentary. Question 1 (continued) In part (d) the response earned the first point for the correct value of g′ ( 140 ) . The response earned the second point with the statement “at t = 140 seconds, the rate of flow of gasoline is changing at a rate of − .005., AP® CALCULUS AB/CALCULUS BC 2015 SCORING GUIDELINES. feet per hour, t is measured in hours, and 0 ≤ t ≤ 8. The pipe is partially blocked, allowing water to drain out the other end of the pipe at a rate modeled by D ( t ) = − 0.04 t 3 + 0.4 t 2 + 0.96 t cubic feet per hour, for 0 ≤ t ≤ 8. There are 30 cubic feet of water in the pipe ...