AP CALCULUS AB 2009 SCORING GUIDELINES
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1 AP CALCULUS AB 2009 SCORING GUIDELINES Question 3 Mighty Cable Company manufactures cable that sells for $120 per meter. For a cable of fixed length, the cost of producing a portion of the cable varies with its distance from the beginning of the cable. Mighty reports that the cost to produce a portion of a cable that is x meters from the beginning of the cable is 6 x dollars per meter. (Note: Profit is defined to be the difference between the amount of money received by the company for selling the cable and the company s cost of producing the cable.) (a) Find Mighty s profit on the sale of a 25-meter cable. 30 (b) Using correct units, explain the meaning of 6 x dx in the context of this problem. 25 (c) Write an expression, involving an integral, that represents Mighty s profit on the sale of a cable that is k meters long. (d) Find the maximum profit that Mighty could earn on the sale of one cable. Justify your answer. (a) Profit = 25 = dollars 2 : { 1 : integral xdx : answer (b) 30 6 x dx is the difference in cost, in dollars, of producing a 25 cable of length 30 meters and a cable of length 25 meters. 1 : answer with units (c) Profit 120 k k 0 6 x dx = dollars 2 : { 1 : integral 1 : expression (d) Let P( k ) be the profit for a cable of length k. P ( k) = k = 0 when k = 400. This is the only critical point for P, and P changes from positive to negative at k = 400. Therefore, the maximum profit is P ( 400) = 16, 000 dollars. 4 : 1 : P ( k) = 0 1 : k = : answer 1 : justification 2009 The College Board. All rights reserved.
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8 AP CALCULUS AB 2009 SCORING COMMENTARY Question 3 Overview This problem provided the context of a company, Mighty Cable, that manufactures and sells cables. Mighty sells cable for $120 per meter, and the cost of producing the portion of a length of cable that is x meters from the beginning of the cable is reported to be 6 x dollars per meter. Part (a) asked for Mighty s profit on the sale of a 25-meter cable, which is defined to be the difference between the revenue from selling the cable and the cost to produce it. To calculate the cost to produce the cable, a student should have recognized that 6 x represents the rate of change of production cost for the cable with respect to the distance x from the beginning of the cable and that integrating this rate of change of cost gives the total cost to produce the cable. Part (b) asked students to 30 interpret the definite integral 6 x dx in the context of the problem. In part (c) students were asked to write an 25 expression involving an integral that represents Mighty s profit on the sale of a k-meter cable, thus generalizing part (a) with the parameter k in place of the constant 25. Part (d) asked for the length k that maximizes profit, which required students either to apply the Fundamental Theorem of Calculus to a qualifying answer from part (d) or to recognize that the rate of change of profit with respect to length k is the difference of rates of change of income ($120 per meter) and of production cost ( 6 k dollars per meter). Sample: 3A Score: 9 The student earned all 9 points. Sample: 3B Score: 6 The student earned 6 points: no points in part (a), 1 point in part (b), 2 points in part (c), and 3 points in part (d). In part (a) the student makes no reference to an integral. In parts (b) and (c) the student s work is correct. In part (d) the student earned the first point with the equation P ( k) = k = 0. The student earned the second and third points by correctly solving for k and finding the maximum profit of $16,000. The justification point was not earned because the student uses a local argument. Sample: 3C Score: 4 The student earned 4 points: 2 points in part (a), no points in part (b), 1 point in part (c), and 1 point in part (d). In part (a) the student s work is correct. The student earned the answer point but does not explicitly state = In part (b) the student does not use the unit of dollars. In part (c) the student earned the first k point for presenting an expression involving 6 x dx. The student incorrectly uses 120x in the integrand and did 0 not earn the second point. In part (d) the student earned the first point with the equation P ( k) = 120k 6 k = 0. Although this profit equation is incorrect, the student was rewarded for correctly handling the imported incorrect expression from part (c). The student solves the equation incorrectly. The student s function does not have an absolute maximum, so the student was not eligible for additional points The College Board. All rights reserved.
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