In a certain city there is a river running through the middle of the city. There are three islands and seven 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. 1.
B. 2.
C. 4.
D. 3.
E. none of these
Answer: D
Mathematics
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A. 
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, r < 0 and 2? < ? < 4?
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A. i
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C. ±7
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