Solve the problem.Find the centroid of the region cut from the fourth quadrant by the circle x2 + y2 = 16.
A. 
= - 
, 
= 
B. 
= 
, 
= - 
C. 
= 
, 
= - 
D. 
= 
, 
= - 
Answer: D
Mathematics
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Evaluate the integral.
A. 
sin-1 
+ C
B. sin-1 
+ C
C. 
tan-1 
+ C
D. tan-1 
+ C
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Find the length of the indicated portion of the curve.r(t) = (1 + 3t)i + (1 + 7t)j + (5 - 5t)k, -1 ? t ? 0
A. 
B. 
C. 
D. 
Mathematics
Graph the exponential function.y = 
x 
A. 
B. 
C. 
D. 
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Solve the system mentally, without the use of a calculator or pencil-and-paper calculation. Try to visualize the graphs of both lines.x + 0y = 90x + y = 4
A. x = 9; y = 4
B. x = 4; y = 9
C. x = 9; y = 2
D. x = 2; y = 
Mathematics