1. Clicker Questions Friday Sep. 3, 2010
Class 1, #4: Which if the following can NOT be the solution of a differential equation?

2. Clicker Questions Friday Sep. 3, 2010
Class 1, #5: Which if the following can NOT be the solution of a differential equation?

3. Clicker Questions Friday Sep. 3, 2010
Class 1, #6: TRUE or FALSE: “A differential equation is a type of function.”
A. TRUE B. FALSE.

4. Clicker Questions Friday Sep. 3, 2010
Question 1: TRUE or FALSE: “A solution of a differential equation is a function.”
A. TRUE B. FALSE.

5. Clicker Questions Friday Sep. 3, 2010
Question 2: TRUE or FALSE: “A solution of a differential equation is a unique function.”
A. TRUE B. FALSE.

6. Clicker Questions Friday Sep. 3, 2010
Question 3: The amount of chemical in a lake is decreasing at a rate of 30% per year. If p(t) is the total amount of the chemical in the lake as a function of time t in years, which differential equation models this situation?
A) p’(t)= B) p’(t)= C) p’(t)=p D) p’(t)=-.3p E) p’(t)=0.7p

7. Clicker Questions Friday Sep. 3, 2010
Question 4: Consider the differential equation xy’+y=0.The solution of this DE is
A. y =1/x, x > 0
B. y = 1/x, x≠0
C. y =0, x>0
D. y =0, for all x
E. More than one of the above