Solve the problem.The number of mosquitoes M(x), in millions, in a certain area depends on the June rainfall x, in inches: 
What rainfall produces the maximum number of mosquitoes?
A. 361 in.
B. 19 in.
C. 0 in.
D. 9.5 in.
Answer: D
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Solve the system by the substitution method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(1, 1)}
B. infinitely many solutions; {
y - 6x = 2} or {
5y = 30x + 10}
C. no solution; ?
D. {(-1.5, -1)}
Use the graph to answer the question.
Mike decides to buy shares of companies A, B, and C, which were initially selling for the same price. The changes in each stock's value are shown in the graph above. Could Mike have ever made a profit off of stock C if he had sold at the right time?
A. No B. Yes
According to the South Coast Air Quality Management District, the level of nitrogen dioxide, a brown gas that impairs breathing, present in the atmosphere on a certain May day in downtown Los Angeles is approximated by 
, 
, where A(t) is measured in pollutant standard index and t is
measured in hours, with 
corresponding to 7 a.m.
?
Find 
, 
, 
.
?
A. ?
B. ?
C. ?
D. 
E. ?
Provide an appropriate response.Under what circumstances can a system of equations be solved more easily by graphing than be substitution?
What will be an ideal response?