Solve the problem.Find the sum of the series 
by expressing 
as a geometric series, differentiating both sides of the resulting equation with respect to x, multiplying both sides by x, differentiating again, and replacing x by 
.
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Simplify.
A. 
B. 
C. 
D. 
Mathematics
Provide an appropriate response.Suppose that you are solving a system of three linear equations in three variables by the row echelon method and you obtain the following augmented matrix. 
What row transformation would you perform next?
A. Add -12 times row 2 to row 3.
B. Add 
times row 2 to row 3.
C. Add -12 times row 1 to -6 times row 3.
D. Multiply row 3 by 
.
Mathematics
Determine whether the argument is valid or invalid.If Ann so wishes, then Bill will be the president. Manuel is a public defender or Bill will be the president. Manuel is not a public defender. Therefore, Ann does not so wish.
A. Valid B. Invalid
Mathematics
Arrange the three fractions from smallest to largest.
, 
, 
A. 
, 
, 
B. 
, 
, 
C. 
, 
, 
D. 
, 
, 
Mathematics