Subtract. Simplify, if possible.11
- 
A. 10
B. 11
C. 10
D. 9
Answer: C
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Write a matrix equation equivalent to the system of equations.9x - 8y + 10z = 3-3x + 9y - 7z = 9
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Solve the problem.One card is selected from a deck of cards. Find the probability of selecting a diamond or a card less than 10. (Note: The ace is considered a low card.)
A. 
B. 
C. 
D. 
Find all the second order partial derivatives of the given function.f(x, y) = cos xy2
A. 
= - y2 sin xy2; 
= 2[ sin (xy2)- 2y2 cos (xy2)] ; 
= 
= 2y [sin (xy2)-y2 cos (xy2)]
B. 
= y2 sin xy2; 
= 2[2y2 cos (xy2) - sin (xy2)] ; 
= 
= 2y[y2 cos (xy2) - sin (xy2)]
C. 
= -y4 cos xy2; 
= - 2x[2xy2 cos (xy2) + sin(xy2)]; 
= 
= - 2y[xy2 cos (xy2) + sin(xy2)];
D. 
= - y2 sin xy2; 
= 2y
; 
= 
= 2
Use the MACRS depreciation rates table to solve the problem. Round to the nearest dollar.MACRS Depreciation Rates 
Respiratory Care, Inc. purchased new packaging equipment (5-year property) at a cost of $9730. Find the book value at the end of 4 years.
A. $2802 B. $3051 C. $3040 D. $1681