M251ex1(fa07)

M251ex1(fa07) - MATH 251 Examination I October 4 2007 Name...

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MATH 251 Examination I October 4, 2007 Name: Student Number: Section: This exam has 12 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. Please turn off and put away your cell phone. 1: 2: 3: 4: 5: 6: 7: 8: 9: 10: 11: 12: Total: Do not write in this box.

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MATH 251 EXAMINATION I October 4, 2007 1. (5 points) Which function below is the integrating factor μ ( t ) that could be used to solve the first order linear differential equation t 2 y - 4 ty = 0? (a) t 4 (b) e 2 t 2 (c) 1 t 4 (d) e 4 t 2. (5 points) Consider the first order differential equation y = - t 3 . Which statement below is false ? Page 2 of 10
MATH 251 EXAMINATION I October 4, 2007

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