Solve the problem.A grain dealer sold to one customer 2 bushels of wheat, 9 of corn, and 6 of rye for $45.20; to another, 9 of wheat, 6 of corn, and 2 of rye for $35.60; and to a third, 6 of wheat, 2 of corn, and 9 of rye for $45.00. What was the price per bushel for corn?
A. $3.40
B. $2.40
C. $2.10
D. $1.60
Answer: B
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Use the method of undetermined coefficients to solve the differential equation.2
+ 11
+ 12y = -3x
A. y = c1e-4x + c2e-3x/2 - 
- 
x
B. y = c1e4x + c2e3x/2 + 
- 
x
C. y = c1e-4x + c2e-3x/2 + 
+ 
x
D. y = c1e-4x + c2e-3x/2 + 
- 
x
Evaluate the integral.
A. -9
B. -18
C. 9
D. 0
Solve the problem.Five minutes after starting his run, a jogger ran 
mile. After 20 minutes of running at a constant speed, he traveled a distance of 1
miles.(i) Write an equation that shows the distance d the jogger traveled t minutes after he starts his run.(ii) What is the slope of the line. Explain its meaning in this situation.(iii) How long would it take him to run 2 miles?
A. (i) d = 
t
(ii) The slope of the line is 
; it represents the jogger's running speed in miles per minute.
(iii) It would take 6 minutes to run 2 miles.
B. (i) d = 
t
(ii) The slope of the line is 
; it represents the jogger's running speed in miles per minute.
(iii) It would take 12 minutes to run 2 miles.
C. (i) d = 
t
(ii) The slope of the line is 
; it represents the jogger's running speed in miles per minute.
(iii) It would take 48 minutes to run 2 miles.
D. (i) d = 
t
(ii) The slope of the line is 
; it represents the jogger's running speed in miles per minute.
(iii) It would take 24 minutes to run 2 miles.
Solve the problem.The graph of y = f(x) in the accompanying figure is made of line segments joined end to end. Graph the derivative of f.
A. 
B. 
C. 
D. 