Use elimination to solve each system of equations, if possible. Identify the system as consistent or inconsistent. If the system is consistent, state whether the equations are dependent or independent. 
+ 
= 4
- 2y = 21
A. (6, 8); consistent and independent
B. (-6, 8); consistent and independent
C. (6, -8); consistent and independent
D. (-6, -8); consistent and independent
Answer: C
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Evaluate the integral.Use the formula 
to evaluate the integral. 
A. x sin-1 x + x + C
B. x sin-1 x - 
+ C
C. x sin-1 x + 
+ C
D. x sin-1 x + 
+ C
Use the graph to answer the question.
Mike decides to buy shares of companies X and Y, which were initially selling for the same price. The changes in each stock's value over 90 days are shown in the graph above. At day 90, Mike decides to buy more of one of the stocks. Which stock should he choose?
A. X B. Y
Evaluate the integral.
A. 
tan-1 
+ C
B. 
tan-1 4x + C
C. 4 tan-1 
+ C
D. 
tan-1 (x + 4) + C
Use a truth table to determine whether the symbolic form of the argument is valid or invalid.p ? q~ p----? ~ q
A. 
The argument is valid.
B. 
The argument is invalid.
C. 
The argument is invalid.
D. 
The argument is valid.