Express the sum or difference as a product of sines and/or cosines.sin(8?) - sin(4?)
A. 2 sin(2?)
B. 2 sin(2?) cos(6?)
C. 2 cos(4?) cos(6?)
D. 2 sin(6?) cos(2?)
Answer: B
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Solve the problem.The function E(x) = 0.0036x3 + 0.0055x2 + 0.19x + 1.76 gives the approximate total earnings of a company, in millions of dollars, where
corresponds to 2006, 
corresponds to 2007, and so on. This model is valid for the years from 2006 to 2010. Determine the earnings for 2007. Round to two decimal places if necessary.
A. $1.96 million B. $1.76 million C. $2.19 million D. $1.95 million
Simplify the rational expression.
A. 
B. 2x2 - 20
C. 2x - 4
D. 
Solve the problem.A baby weighed 6 pounds at birth and gained 2 pounds a month. How much did the baby gain in 3 months?
A. 6 lb B. 24 lb C. 11 lb D. 12 lb
Solve the problem.A moving firm charges a flat fee of $45 plus $40 per hour. Let y be the cost in dollars of using the moving firm for x hours. Find the slope-intercept form of the equation.
A. y = 40x + 45 B. y = 45x - 40 C. y = 40x - 45 D. y = 45x + 40