Perform the indicated operations. Write the resulting complex number in standard form. 
A. -2
B. -2i
C. 2i
D. 16i
Answer: C
Mathematics
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Find the center of mass of a thin plate covering the given region with the given density function.The region bounded by the curves y = ± 
and the lines x = 1 and x = 9, with density ?(x) = 
A. 
= 3, 
= 0
B. 
= 5, 
= 0
C. 
= 2, 
= 0
D. 
= 4, 
= 0
Mathematics
Solve for the specified variable.S = 2?rh for h
A. h = S - 2?r
B. h = 2?rS
C. h = 
D. h = 
Mathematics
Find the derivative of the function.
?
?
A. 
B. 
C. 
D. 
Mathematics
Solve the equation.4-x = 
A. 
B. 
C. {-2}
D. {2}
Mathematics