Solve the problem.During rush hours, substantial traffic congestion is encountered at the intersections shown inthe figure. The arrows indicate one-way streets. As the figure shows, 600 cars per hour come down 
to intersection A, and 400 cars per hour come down 
to intersection A. x of these cars leave A on 
and w cars leave A on 
-4.0px;" /> 400 in 600 out 
900 out 400 in 5th Street 6th StreetThe number of cars entering intersection A must equal the number leaving, so that 
or 
By writing an equation representing the traffic entering and leaving each of the intersections A, B, C, and D, obtain a system of four equations. Solve the system using w as the parameter.
A. (400 - w, 1100 + w, 1400 - w, w)
B. (1000 - w, 500 + w, 1400 - w, w)
C. (1000 - w, 1100 + w, 500 - w, w)
D. (1000 - w, w - 500, 1400 - w, w)
Answer: B
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Provide an appropriate response.If 
of all plumbers in the city belong to the plumber's union, what percent belong to the union?
A. 60% B. 40% C. 80% D. 20%
Solve the problem.In a complete graph with 12 vertices (A through L), the total number of Hamilton circuits (including mirror-image circuits) that start at vertex A is
A. 12!. B. 10!. C. 11!. D. 13!. E. none of these
State whether the system is consistent or inconsistent. If it is consistent, then state whether the graphs' equations are dependent or independent. State the number of solutions.
A. Consistent; independent; no solutions B. Inconsistent; no solutions C. Consistent; dependent; infinitely many solutions D. Inconsistent; infinitely many solutions
For the following equation, graph y = f1(x) and y = f2(x) on the same screen on your calculator. From the graphs, make a conjecture as to whether the equation is an identity. If so, prove your conjecture.
= 
What will be an ideal response?