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Unformatted text preview: MATH 251 Examination July 16, 2009 Name: Student Number: Section: This exam has 9 questions for a total of 100 points. In order to obtain full credit for partial credit problems, all work must be shown. Credits will not be given for an answer not supported by work. The point value for each question is in parentheses to the right of the question number. You may not use a calculator on this exam. Please turn off and put away your cell phone. The last sheet of the booklet can be removed. Be careful to remove only the last page of the examination . 1: 2: 3: 4: 5: 6: 7: 8: 9: Total: Do not write in this box. MATH 251 EXAMINATION July 16, 2009 1. (10 points) For parts (a) through (e) below, a list of differential equations is given. For each part, write down the letter corresponding to the equation on the list with the specified proper- ties. There is only one correct answer to each part. A. y = 2 y + t B. y = e 2 y- t C. y = e y- 1 D. y 00 + 4 y- 5 y = 2 E. y 00 + e t y + t 2 y = 0 F. y 00-...
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