s251ex1(fa10) - y = 2 is semistable. (c) -3 (d) 0 13. (a) t...

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MATH 251 Exam I September 27, 2010 ANSWER KEY (Form A) 1. (a) No (b) Yes (c) Yes (d) No 2. A 3. B 4. B 5. D 6. A 7. B 8. D 9. D 10. C 11. (a) x N e y M y = = (b) C y xe y = + ) cos( (c) 1 ) cos( + = + π y xe y 12. (a) y = -3, 0, 2 (b) y = -3 is (asymptotically) stable, y = 0 is unstable,
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Unformatted text preview: y = 2 is semistable. (c) -3 (d) 0 13. (a) t t e t C e C y 2 2 2 1--+ = (b) ) 4 1461 ( ) 365 ( 4 2 730 ) 365 ( 2 ) 365 ( 2 t e e t e y t t t-=--=-----(c) 0 14. y = C 1 t 4 + C 2 t 3...
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This note was uploaded on 07/16/2011 for the course MATH 251 taught by Professor Chezhongyuan during the Spring '08 term at Pennsylvania State University, University Park.

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