Write the sum or difference as a product containing only sines and/or cosines.cos(6?) - cos(2?)
A. 2 cos(4?) cos(2?)
B. 2 cos(2?)
C. -2 cos(4?) sin(2?)
D. -2 sin(4?) sin(2?)
Answer: D
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Find the mean for the given sample data. Unless otherwise specified, round your answer to one more decimal place than that used for the observations.Bill kept track of the number of hours he spent exercising each week. The results for four months are shown below. Find the mean number of hours Bill spent exercising per week. 
A. 8.0 B. 7.7 C. 7.5 D. 7.1
Solve the absolute value equation.|x + 7| + 6 = 12
A. x = -1 B. x = -13, -1 C. no solution D. x = 1, 13
Determine whether the graph of the given equation is symmetric with respect to the x-axis, the y-axis, and/or the origin.x2 + y2 = 9
A. x-axis B. x-axis, y-axis, origin C. y-axis, origin D. Origin
Use substitution to determine whether the system of linear equations has no solutions, one solution, or infinitely many solutions.5x - 25y = 20y = 
x - 
A. One B. No solutions C. Infinitely many