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Unformatted text preview: ejm753 Homework 8 Cepparo (58400) 1 This printout should have 22 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points If the points (0 , 3) , ( 1 2 , 7) , (1 , 1) , ( 3 2 , 8) , (2 , 6) lie on the graph of a continuous function y = f ( x ), use the trapezoidal rule and all these points to estimate the definite integral I = integraldisplay 2 f ( x ) dx . 1. I 21 2 2. I 39 4 3. I 10 4. I 43 4 5. I 41 4 correct Explanation: The trapezoidal rule estimates the definite integral I as h 2 parenleftBig f (0) + 2 f ( 1 2 ) + 2 f (1) + 2 f ( 3 2 ) + f (2) parenrightBig . With h = 1 2 and the given values of f , there fore, the area is estimated by I 41 4 . 002 10.0 points The graph of a function f is shown in 2 4 6 8 10 2 4 6 8 Use Simpsons Rule with n = 6 to estimate the integral I = integraldisplay 9 3 f ( x ) dx . 1. I 22 2. I 70 3 correct 3. I 68 3 4. I 67 3 5. I 23 Explanation: Simpsons Rule estimates the integral I = integraldisplay 9 3 f ( x ) dx by I 1 3 braceleftBig f (3) + 4 f (4) + 2 f (5) + 4 f (6) + 2 f (7) + 4 f (8) + f (9) bracerightBig , taking n = 6. Reading off the values of f from its graph we thus see that I 70 3 . 003 10.0 points ejm753 Homework 8 Cepparo (58400) 2 If f is the function whose graph on [0 , 10] is given by 2 4 6 8 2 4 6 8 use the Trapezoidal Rule with n = 5 to esti mate the definite integral I = integraldisplay 8 3 f ( x ) dx . 1. I 43 2 2. I 22 3. I 47 2 4. I 45 2 5. I 23 correct Explanation: The Trapezoidal Rule estimates the definite integral I = integraldisplay 8 3 f ( x ) dx by I 1 2 bracketleftBig f (3) + 2 { f (4)+ + f (7) } + f (8) bracketrightBig when n = 5. For the given f , therefore, I 1 2 bracketleftBig 7 + 2 { 5 + 5 + 4 + 4 } + 3 bracketrightBig = 23 , reading off the values of f from the graph. 004 10.0 points Below is the graph of a function f . 1 2 3 1 2 3 2 4 6 Estimate the definite integral I = integraldisplay 3 3 f ( x ) dx using the Midpoint Rule with six equal subin tervals. 1. I 7 2. I 5 3. I 6 4. I 8 5. I 9 correct Explanation: Since [ 3 , 3] is subdivided into six equal subintervals, each of these will have length 1 and the six corresponding rectangles are shown as the grayshaded areas in ejm753 Homework 8 Cepparo (58400) 3 1 2 3 1 2 3 2 4 6 The heights of the rectangles are midpoint sample values of f that can be read off from the graph. Thus, with midpoints, I 4 1 4 + 1 + 3 + 6 = 9 . 005 10.0 points Use Simpsons Rule with 2 subintervals to estimate the area of the region in the first quadrant enclosed by the graph of f ( x ) = 2 ln(1 + 2 x x 2 ) and the xaxis....
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This note was uploaded on 04/28/2008 for the course M 408 L taught by Professor Cepparo during the Spring '08 term at University of Texas at Austin.
 Spring '08
 Cepparo

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