Solve the problem.At a ticket booth, customers arrive randomly at a rate of x per hour. The average line length is 
where 
To keep the time waiting in line reasonable, it is decided that the average line length should not exceed 10 customers. Solve the inequality 
to determine the rates x per hour at which customers can arrive before a second attendant is needed.
A. 0 ? x ? 17
B. 0 ? x ? 19
C. 0 ? x ? 20
D. 0 ? x ? 18
Answer: D
Mathematics
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Provide an appropriate response.Find the sum of the series 
by expressing 
as a geometric series, differentiating both sides of the resulting equation with respect to x, and replacing x by 
.
A. 
B. 
C. 
D. 
Mathematics
Solve.If a car travels at a constant speed, which graph best represents the distance the car has traveled?Graph AGraph B
?
Graph CGraph D
?
A. Graph B B. Graph D C. Graph C D. Graph A
Mathematics
Write the number 3.9 in the form a + bi.
A. 3.9 + 0i B. 3.9i - 0 C. 3.9 D. 3.9i
Mathematics
Divide and simplify to the form a + bi.
A. - 
+ 
i
B. - 
- 
i
C. 
- 
i
D. 
+ 
i
Mathematics