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Unformatted text preview: Valenica, Daniel Homework 2 Due: Sep 11 2007, 3:00 am Inst: Cheng 1 This printout should have 20 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Rewrite the sum 3 n 2 + 4 n 2 + 3 n 2 + 8 n 2 + ... + 3 n 2 + 4 n n 2 using sigma notation. 1. n X i = 1 3 n 2 + 4 i n 2 correct 2. n X i = 1 4 n 2 + 3 i n 2 3. n X i = 1 3 n 2 i + 4 i n 2 4. n X i = 1 3 i n 2 + 4 i n 2 5. n X i = 1 4 n 2 i + 3 i n 2 6. n X i = 1 4 i n 2 + 3 i n 2 Explanation: The terms are of the form 3 n 2 + 4 i n 2 , with i = 1 , 2 , ... , n . Consequently in sigma notation the sum becomes n X i = 1 3 n 2 + 4 i n 2 . keywords: Stewart5e, summation notation, Riemann sum form 002 (part 1 of 1) 10 points Estimate the area, A , under the graph of f ( x ) = 2 x on [1 , 5] by dividing [1 , 5] into four equal subintervals and using right endpoints. Correct answer: 2 . 567 . Explanation: With four equal subintervals and right end points as sample points, A n f (2) + f (3) + f (4) + f (5) o 1 since x i = x * i = i + 1. Consequently, A 2 . 567 . keywords: Stewart5e, area, rational function, Riemann sum, 003 (part 1 of 1) 10 points The graph of a function f on the interval [0 , 10] is shown in 2 4 6 8 10 2 4 6 8 Estimate the area under the graph of f by dividing [0 , 10] into 10 equal subintervals and using right endpoints as sample points. 1. area 56 correct Valenica, Daniel Homework 2 Due: Sep 11 2007, 3:00 am Inst: Cheng 2 2. area 60 3. area 58 4. area 57 5. area 59 Explanation: With 10 equal subintervals and right end points as sample points, area n f (1) + f (2) + ... f (10) o 1 , since x i = i . Consequently, area 56 , reading off the values of f (1) , f (2) , ..., f (10) from the graph of f . keywords: Stewart5e, graph, estimate area, Riemannn sum 004 (part 1 of 1) 10 points Estimate the area under the graph of f ( x ) = sin x between x = 0 and x = 4 using five approx imating rectangles of equal widths and right endpoints as sample points. 1. area . 328 2. area . 348 correct 3. area . 388 4. area . 368 5. area . 308 Explanation: An estimate for the area, A , under the graph of f on [0 , b ] with [0 , b ] partitioned in n equal subintervals [ x i 1 , x i ] = h ( i 1) b n , ib n i and right endpoints x i as sample points is A n f ( x 1 ) + f ( x 2 ) + ... + f ( x n ) o b n . For the given area, f ( x ) = sin x, b = 4 , n = 5 , and x 1 = 1 20 , x 2 = 1 10 , x 3 = 3 20 , x 4 = 1 5 , x 5 = 1 4 ....
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 Fall '07
 CHENG

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