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. 4 in.
B. 16 in.
C. 2 in.
D. 0 in.
Answer: C
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Solve the problem.You place a mirror on the ground 100 ft away from a flag pole. You then back up from the mirror until you see the top of the flag pole in the mirror. If the distance from your eyes to the ground is 
and you are standing 12 ft from the mirror, how tall is the flag pole to the nearest foot?
A. 42 ft B. 20 ft C. 240 ft D. 8 ft
Solve the equation.5n = 6(9n + 7)
A. - 
B. 
C. 
D. 
Determine whether the given relationship represents a function.The cost of tuition for three credit hours of a history class is related to the charge per credit hour.
A. Function B. Not a function
Find the domain of the variable in the equation. Write the answer in interval notation.
= 
A. (-2, 4) ? (4, ?) B. (-?, 2) ? (2, 4) ? (4, ?) C. (-?, -2) ? (-2, 4) ? (4, ?) D. (-?, -2) ? (4, ?)