In a certain city there is a river running through the middle of the city. There are three islands and nine bridges as shown in the figure below.
In the graph that models this situation, the degree of the vertex that represents the North Bank is
A. 3.
B. 1.
C. 4.
D. 2.
E. none of these
Answer: A
Mathematics
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A. 
B. 
C. 
D. 
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A right triangle with acute angle ? is given. Evaluate the indicated trigonometric function of the acute angle ?.Find sin ?.
A. 
B. 
C. 
D. 
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Solve the problem.An experienced bank auditor can check a bank's deposits twice as fast as a new auditor. Working together it takes the auditors 14 hours to do the job. How long would it take the experienced auditor working alone?
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Mathematics