Solve the problem.Mr. and Mrs. Jones have a personal loan of $13,600. They have paid off 
of the loan. How much of the loan have they paid off?
A. $1700
B. $7200
C. $6400
D. $6800
Answer: D
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Calculate the circulation of the field F around the closed curve C.F = xyi + 6j , curve C is r(t) = 5 cos ti + 5 sin tj, 0 ? t ? 2?
A. 
B. 12
C. 0
D. - 
Solve the problem.For the given stock investment, find the percentage return:
A. 39.0% B. 53.7% C. 38.6% D. 153.7%
Find all the second partial derivatives.f(x, y) = cos xy2
A. 
= -y4 cos xy2; 
= -2x[2xy2 cos(xy2) + sin(xy2)]; 
= 
= -2y[xy2 cos(xy2) + sin(xy2)]
B. 
= - y2 sin xy2; 
= 2y
; 
= 
= 2
C. 
= - y2 sin xy2; 
= 2[ sin (xy2) - 2y2 cos (xy2)]; 
= 
= 2y [sin (xy2) - y2 cos (xy2)]
D. 
= y2 sin xy2; 
= 2[2y2 cos (xy2) - sin (xy2)]; 
= 
= 2y[y2 cos (xy2) - sin (xy2)]
Solve the problem.If f(x) = 
and f(15) = -5, what is the value of A?
A. A = -227 B. A = -233 C. A = 233 D. A = 227