A ladder 20 feet long is leaning against the wall of a house (see the figure below). The base of the ladder is pulled away from the wall at a rate of 2 feet per second. How fast is the top of the ladder moving down the wall when its base is 14 feet from the wall? Round your answer to two decimal places.
?
?
, 
?
A. 6.00 ft/sec
B. -5.33 ft/sec
C. -1.96 ft/sec
D. 5.33 ft/sec
E. -5.00 ft/sec
Answer: C
Mathematics
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1. ? dx
2. 
3. 
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