Solve the problem.Find the mass of the solid in the first octant between the spheres 
and 
if the density at any point is inversely proportional to its distance from the origin.
A. 12k?
B. 6k?
C. 9k?
D. 72k?
Answer: C
Mathematics
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Find the most general antiderivative.
dx
A. 
- 
+ 
+ C
B. 
- 
- 
+ C
C. 
- 
- 
+ C
D. -5x4 - 5x5 + C
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Solve the inequality. Express your answer using interval notation.3x + 7 ? 2x + 12
A. (-?, 5)
B. [5, ?)
C. [19, ?)
D. (-?, 5]
Mathematics
Use the summation properties to evaluate the series. The following rules may be needed: 
.
A. - 48 B. - 60 C. - 36 D. 20
Mathematics
Use Cramer's rule to find the solution of the system, if possible.
?
?
A. 
B. 
C. 
D. The system is inconsistent.
E. The equations are dependent.
Mathematics