Graph the function by hand. Use the graph to (a) find the range, (b) give the interval over which the function is increasing, and (c) give the interval over which the function is decreasing. Round approximations to two decimal places.f(x) = 
A. (a) (-?, ?) (b) (-?, ?) (c) None
B. (a) (-?, ?) (b) (-?, ?) (c) (-?, ?)
C. (a) (-?, ?) (b) None (c) (-?, ?)
D. (a) (-4, ?) (b) (-?, ?) (c) None
Answer: A
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Solve the problem.After 3 years, the value of a certain car purchased new for x dollars is given by the expression 
-3 ? x. Simplify this expression.
A. 
x dollars
B. 
x dollars
C. 
x dollars
D. 
x dollars
Find the exact value of the expression.cos 
cos 
+ sin 
sin 
A. 1
B. 
C. 
D. 
Solve the problem.A racetrack curve is banked so that the outside of the curve is slightly elevated or inclined above the inside of the curve. This inclination is called the elevation of the track. The maximum speed on the track in miles per hour is given by
where r is the radius of the track in miles and ? is the elevation in degrees. Find the maximum speed for a racetrack with an elevation of 28° and a radius of 
Round to the nearest mile per hour.
A. 198 mi/hr B. 175 mi/hr C. 39,350 mi/hr D. 13,526 mi/hr
Graph the system of inequalities, and find the coordinates of the vertices.3x - 2y ? 6 x - 1 ? 0
A. 
B. 
C. 
D. 