Solve the problem.At a single ticket booth, customers arrive randomly at a rate of x per hour. The average line length is given by 
where 
To keep the wait in line reasonable, it is required that the average line length should not exceed 6 customers. Determine the range of rates at which customers can arrive before a second attendant is needed. Express your answer in interval form.
A. [0, 17]
B. [0, 18]
C. [0, 19)
D. [0, 16]
Answer: A
Mathematics
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A. 
7
B. 
5
C. 62/7
D. 
6
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A. 
B. 
C. 
D. 
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Find the derivative of the function.
?
?
A. 
B. 
C. 
D. 
E. 
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