M251ex1(fa09)

M251ex1(fa09) - MATH 251 Exam I Name Student Number...

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MATH 251 Exam I Sep 29, 2009 Name: Student Number: Instructor: Section: There are 6 multiple choice questions and 5 partial credit questions. In order to obtain full credit for the partial credit problems, all work must be shown. Credit will not be given for an answer not supported by work on a partial credit problem. THE USE OF CALCULATORS IS NOT PERMITTED IN THIS EXAMINA- TION. For multiple choice problems, write the letter of your choice in the space provided below. Your Answer : Points awarded 1. (5 pts) Q. 7 (10 pts) 2. (5 pts) Q. 8 (10 pts) 3. (5 pts) Q. 9 (15 pts) 4. (5 pts) Q. 10 (20 pts) 5. (5 pts) Q. 11 (15 pts) 6. (5 pts)
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MATH 251 -Exam I- 1. (5 points) Which of the following diFerential equations is Linear ? (a) yy + ty = t + 1 (b) ln( t 2 ) y ′′ + t 3 / 2 y + e t +3 = 0 (c) ty + cos y = 1 (d) 2 y - y = y 2 2. (5 points) Which function is a solution of the diFerential equation ( y ) 2 - 5 ty = 5 t 2 +1 ? (a)
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M251ex1(fa09) - MATH 251 Exam I Name Student Number...

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