Solve the system using the inverse matrix method.
A. x = 16, y = 63, z = 38; (16, 63, 38)
B. x = -17, y = 32, z = 11; (-17, 32, 11)
C. x = 4, y = 36, z = -6; (4, 36, -6)
D. x = -8, y = 39, z = -22; (-8, 39, -22)
Answer: D
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Calculate the area of the surface S. S is the portion of the cone 
+ 
= 
that lies between z = 2 and z = 6.
A. 72
?
B. 30
?
C. 30
D. 24
?
Estimate the magnitude of the error involved in using the sum of the first four terms to approximate the sum of the entire series.
A. 1.68 × 10-1 B. 1.96 × 10-2 C. 6.00 × 10-2 D. 3.36 × 10-2
A manufacturing company wants to maximize profits on products A, B, and C. The profit margin is $3 for A, $6 for B, and $15 for C. The production requirements and departmental capacities are as follows: 
What is the maximum profit if the capacity of the painting department changes to 40,000 hours?
A. $120,000 B. $225,000 C. $60,000 D. $95,000
Find all values of ? in [-4?, 4?] satisfying each of the following equations. sin ? = 0
A. ? = - 
, - 
, 
B. ? = - 
, - 
, - 
, - 
, 
, 
, 
, 
C. ? = -4?, -2?, 0, 2?, 4?
D. ? = -4?, -3?, -2?, -?, 0, ?, 2?, 3?, 4?