Factor completely.9x2 - 64
A. (3x + 8)(3x - 8)
B. (9x + 1)(x - 64)
C. (3x - 8)2
D. (3x + 8)2
Answer: A
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Find the center of mass of a thin plate covering the given region with the given density function.The region enclosed by the parabolas y = 18 - x2 and y = x2, with density ?(x) = x2
A. 
= 0, 
= 9
B. 
= 0, 
= 
C. 
= 9, 
= 0
D. 
= 0, 
= 18
The pictograph shows the number of bicyclists who participated in the Labor Day weekend bicycle race for the years indicated. 
What was the amount of decrease in the number of cyclists from 2001 to 2002?
A. 35 B. 20 C. 25 D. 15
Solve the problem.If two cards are drawn without replacement from an ordinary deck, find the probability that the second card is an ace, given that the first card was an ace.
A. 
B. 
C. 
D. 
?Find the speed v, in miles per hour, that will minimize costs on a 125-mile delivery trip. The cost per hour for fuel is 
dollars, and the driver is paid 
dollars per hour. (Assume there are no costs other than wages and fuel.)
?
A. ?75 mph B. ?125 mph C. ?200 mph D. 80? mph E. ?40 mph