Exam 9: Differential Equations
Exam 1: Functions and Models160 Questions
Exam 2: Limits and Derivatives160 Questions
Exam 3: Differentiation Rules160 Questions
Exam 4: Applications of Differentiation159 Questions
Exam 5: Integrals160 Questions
Exam 6: Applications of Integration160 Questions
Exam 7: Techniques of Integration160 Questions
Exam 8: Further Applications of Integration160 Questions
Exam 9: Differential Equations160 Questions
Exam 10: Parametric Equations and Polar Coordinates160 Questions
Exam 11: Infinite Sequences and Series160 Questions
Exam 12: Vectors and the Geometry of Space159 Questions
Exam 13: Vector Functions160 Questions
Exam 14: Partial Derivatives158 Questions
Exam 15: Multiple Integrals160 Questions
Exam 16: Vector Calculus160 Questions
Exam 17: Second-Order Differential Equations160 Questions
Select questions type
Select the correct Answer: for each question.
-For what nonzero values of
does the function
satisfy the differential equation
for all values of A and B?
a.
b.
c.
d.
e. 
(Short Answer)
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Choose the differential equation corresponding to this direction field.Select the correct Answer 
(Multiple Choice)
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Let
be a positive number.A differential equation of the form
where
is a positive constant is called
because the exponent in the expression
is larger than the exponent 1 for natural growth.An especially prolific breed of rabbits has the growth term
If
such rabbits breed initially and the warren has
rabbits after
months, then when is doomsday?
(Multiple Choice)
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A curve passes through the point
and has the property that the slope of the curve at every point P is
times the y-coordinate P.What is the equation of the curve?
(Essay)
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A certain small country has $20 billion in paper currency in circulation, and each day $70 million comes into the country's banks.The government decides to introduce new currency by having the banks replace old bills with new ones whenever old currency comes into the banks.Let
denote the amount of new currency in circulation at time
with
Formulate and solve a mathematical model in the form of an initial-value problem that represents the "flow" of the new currency into circulation (in billions per day).
(Essay)
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Kirchhoff's Law gives us the derivative equation
If
use Euler's method with step size 0.1 to estimate
after 0.3 second.
(Short Answer)
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Select the correct Answer: for each question.
-Solve the differential equation. 
(Multiple Choice)
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A function
satisfies the differential equation
What are the constant solutions of the equation?
(Essay)
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Suppose that a population develops according to the logistic equation
where
is measured in weeks.What is the carrying capacity?
(Essay)
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