Find the area of the surface generated by revolving the curves about the indicated axis.x = sin t, y = 6 + cos t, 0 ? t ? 2?; x-axis
A. 36?2
B. 18?2
C. 6?2
D. 24?2
Answer: D
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Solve the system by the elimination method. 7x + 8y = 67 3x + 6y = 39
A. {(4, 5)} B. {(5, 5)} C. {(5, 4)} D. ?
Find the curvature of the space curve.r(t) = -5i + (7 + 2t)j + (t2 + 4)k
A. ? = 
B. ? = 
C. ? = - 
D. ? = 
In 
, the medians are 
, 
, and 
. If RM = 9, SN = 12, and TP = 16, find the distance from the centroid of this triangle to the midpoint of side 
.
A. 4
B. 6
C. 8
D. 10
The total weekly cost (in dollars) incurred by a company in pressing x compact discs is 
.
?
Round answers to the nearest cent.
?
What is the actual cost incurred in producing the 2,001st disc?
?
$__________
?
What is the actual cost incurred in producing the 3,001st disc?
?
$__________
?
What is the marginal cost when 
?
?
$__________
?
What is the marginal cost when 
?
?
$__________
What will be an ideal response?