M251ex1(su07)

# M251ex1(su07) - MATH 251 Examination I July 9 2007 Name...

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MATH 251 Examination I July 9, 2007 Name: Student Number: Section: This exam has 11 questions for a total of 100 points. In order to obtain full credit for partial credit problems, all work must be shown. Credit 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. 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: Total: Do not write in this box.

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MATH 251 EXAMINATION I July 9, 2007 1. (10 points) For parts (a) through (e) below, a list of di±erential equations is given. For each part, write down the letter corresponding to the equation on the list with the speci²ed 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 ′′ + 4 y - 5 y = 2 E. y ′′ + e t y + t 2 y = 0 F. y ′′ - 4 y = t y G. y ′′′ + 3 y ′′ + 3 y + y = t 5 + ln t H. y ′′′ + y y = e 2 t sin 5 t (a) First order autonomous equation. (b) Second order homogeneous linear equation.
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M251ex1(su07) - MATH 251 Examination I July 9 2007 Name...

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