Simplify 
if 
for some real number x.
What will be an ideal response?
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Solve the problem.Find the least squares line through the points 
and 
A. y = -8x - 22 B. y = 12x - 18 C. y = 12x - 22 D. y = -8x - 18
Solve the problem.A movie theater has two screens and shows its movie continuously. A 30 minute documentary is shown on one screen. A 90 minute feature is shown on the other screen. If both movies begin at noon, how many minutes will pass before both movies begin again at the same time?
A. 120 minutes B. 90 minutes C. 10 minutes D. 180 minutes
Find cos(A - B).cos A = - 
and cos B = - 
, with A and B in quadrant III.
A. 
B. 
C. 
D. 
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 ? 19 B. 0 ? x ? 17 C. 0 ? x ? 18 D. 0 ? x ? 20