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MATH 251
Examination I
July 9, 2007
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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.
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11:
Total:
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View Full DocumentMATH 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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 Spring '08
 CHEZHONGYUAN
 Math, Differential Equations, Equations, Partial Differential Equations

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