Simplify.cos(u + v) cos v + sin(u + v) sin v
A. cos u
B. cos u (1 + cos2 v)
C. cos v
D. sin v
Answer: A
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Change the given polar coordinates (r, ?) to Cartesian coordinates (x, y).
A. 
B. 
C. 
D. 
Solve.The average value of a certain type of automobile was $13,380 in 1995 and depreciated to $5820 in 1998. Let y be the average value of the automobile in the year x, where x = 0 represents 1995. Write a linear equation that models the value of the automobile in terms of the year x.
A. y = -2520x + 5820
B. y = - 
x - 5820
C. y = -2520x + 13,380
D. y = -2520x - 1740
Find an equation of the line containing the given pair of points(4, 0) and (-7, -5)
A. y = 
x - 
B. y = - 2x - 19
C. y = 2x - 19
D. y = - 
x - 
Identify the open intervals where the function is changing as requested.Increasing
A. (-?, 0) B. (0, 3) C. (-?, -1) D. (-1, 0)