Solve the system.
A. {(2, -4), (2, 4)}
B. {(2, 4), (4, 2), (-2, -4), (-4, -2)}
C. {(2, 4), (-2, 4), (2, -4), (-2, -4)}
D. {(-2, -4), (-4, -2)}
Answer: C
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Use a grapher to graph the function.The charge y on a certain capacitor as a function of time is given by 
Charge is measured in coulombs, and time is measured in seconds. Sketch two cycles of y as a function of t. Label the point on the horizontal axis which represents the end of the second cycle.
A. 
B. 
C. 
D. 
The size of two matrices is given. Find the size of the product AB and the product BA, if the products exist.A is 1 × 3, B is 3 × 1.
A. AB is 1 × 1, BA is undefined. B. AB is undefined, BA is 3 × 3. C. AB is 1 × 1, BA is 3 × 3. D. AB is 3 × 3, BA is 1 × 1.
Solve the problem.The Mathematics Department is holding an election for department chair. Each member ranks the candidates from first to third. The preference table below shows the results of the ballots with candidates Clark (C), Jones (J), and Smith (S). 
Determine the winner using the pairwise comparison method and if the winner received a majority of first place votes.
A. Jones; No B. Smith; No C. Smith; Yes D. Jones; Yes
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A. 18.26 m per sec B. 2.28 m per sec C. 9.13 m per sec D. 0.11 m per sec