Solve the problem.In general, cos 2? ? 2 cos ?. Determine graphically whether there are any values of ? on 
for which 
If there are any such values, estimate them from your graph and refine your estimate numerically to the nearest tenth of a degree.
A. None
B. 111.5° and 248.5°
C. 109.5° and 246.5°
D. 90.0° and 270.0°
Answer: B
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Find the first term and the common ratio of the geometric sequence.an = 
n
A. a1 = - 
, r = 
B. a1 = 
, r = - 
C. a1 = - 
, r = - 
D. a1 = 
, r = 
n
Solve the problem.Use the following graph which shows the number of customer service calls to a major appliance manufacturer, in millions, for the years 2006-2012. Use the graph to represent the set in roster form.
2006200720082009201020112012YearThe set of years in which the number of customer service calls exceeded 1.1 million.
A. {2006, 2007, 2008, 2010, 2011} B. {2009, 2012} C. {2006, 2007, 2008, 2009, 2010, 2011} D. {2006, 2007, 2008, 2011}
Solve the problem.If 
and 
both converge conditionally, what can be said about 
?
A. The series always converges. B. The series may converge or diverge. C. The series always diverges.
Find the square root.
A. 4 B. 2 C. 81 D. 3