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 ? 20
B. 0 ? x ? 19
C. 0 ? x ? 17
D. 0 ? x ? 18
Answer: D
Mathematics
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Find the average value of 
over the given region.
+ z2 over the rectangular solid in the first octant bounded by the coordinate planes and the planes 
, 
, 
A. 
B. 
C. 
D. 
Mathematics
Find the inverse of the function.f(x) = 
A. f-1(x) = (x - 7)3
B. f-1(x) = (x + 7)3
C. f-1(x) = x3 + 7
D. f-1(x) = 
- 7
Mathematics
Find the sum, if it exists.0.8 + 0.08 + 0.008 + 0.0008 + . . .
A. 
B. 
C. 
D. Does not exist
Mathematics
From the graph of the quadratic function 
, determine the equation of the axis of symmetry.
A. 
B. 
C. 
D. 
E. 
Mathematics