Express the sum or difference as a product of sines and/or cosines.cos 
+ cos 
A. 2 sin(4?) sin ?
B. 2 cos(4?)
C. 2 sin(4?) sin 
D. 2 cos(4?) cos 
Answer: D
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Solve the problem.Using a phone card to make a long distance call costs a flat fee of $0.39 plus $0.32 per minute starting with the first minute. Find a linear function f(x) = mx + b whose input is the number of minutes for a call and whose output is the corresponding cost for the call.
A. f(x) = 0.39x B. f(x) = 0.32x C. f(x) = 0.39x + 0.32 D. f(x) = 0.32x + 0.39
Supply the missing numbers. Round decimals to the nearest thousandth and percents to the nearest tenth of a percent.fractiondecimalpercent?4%
A.
 ? | 0.04 |
B.
 ? | 0.4 |
C.
 ? | 0.4 |
D.
 ? | 0.04 |
Solve the problem.Use the following graph, which shows the sales of digital music players, in millions, at a national electronics retail store for the years 2005-2012. Use the graph to represent the set in roster form.
20052006200720082009201020112012YearThe set of years included in the graph in which digital music player sales were between 3 million and 5 million.
A. {2008, 2009, 2010} B. {2009, 2010} C. {2008, 2009} D. {2007, 2008, 2009}
Use the frequency table below to answer the following question(s).
The interquartile range of this data set is
A. 2. B. 0. C. 4. D. 6. E. none of these