Solve the problem.A person puts $29 into a bank account on January 1, $39 on February 1, $49 on March 1, and so forth. How much has the person put into the bank account by December 30?
A. $834
B. $1068
C. $1008
D. $2016
Answer: C
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Find the center of mass of a thin plate of constant density covering the given region.The region enclosed by the parabolas y = - x2 + 18 and y = x2
A. 
= 0, 
= 
B. 
= 0, 
= 9
C. 
= 0, 
= 18
D. 
= 9, 
= 0
Describe the given set of points with a single equation or with a pair of equations.The circle of radius 8 centered at the point (2, -4, 4) and lying in a plane parallel to the xy plane
A. (x - 2)2 + (y - 4)2 = 82 and x + y = -2
B. (x - 2)2 + (y - 4)2 = 82 and z = 4
C. 
2+ 
2= 82 and z = 4
D. 
2 + 
2+ 1 = 82
Find the slope, if possible, of the line passing through the pair of points.(-2, 4) and (-7, 7)
A. - 
B. - 
C. - 
D. 
Find all values of the variable for which the rational expression is undefined.
A. 7, 9 B. None C. 7 D. -7