Solve the inequality.
? x + 1 or 
- 1 > 
A. (-?, -2) ? (42, ?)
B. [42, ?)
C. (-?, 4] ? [42, ?)
D. (-?, -2] ? [42, ?)
Answer: D
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Solve the problem.The sales of a mature product (one which has passed its peak) are given by the function 
where t is time in years. Find the sales after 6 years if 
and 
A. 12,462 B. 52,761 C. 24,923 D. 21,451
Use the quadratic formula or graphing methods to solve the inequality.9x2 ? 3 - 3x
A. 
? -0.768 ? x ? 
? 0.434
B. x ? 
? -0.768
C. x ? 
? -0.768 or x ? 
? 0.434
D. x ? 
? 0.434
Using the horizontal-line test, determine whether the function is one-to-one.
A. one-to-one B. not one-to-one
Solve the problem.In a track meet, Dylan runs 800 meters in 106.5 seconds. What was his average speed in meters per second? (Round to the nearest tenth.)
A. 7.5 B. 1.3 C. 0.8 D. 0.1