If the temperature is constant, then the atmospheric pressure P (in pounds/square inch) varies with the altitude above sea level h in accordance with the law 
where p?0 is the atmospheric pressure at sea level and k is a constant.
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If the atmospheric pressure is 17 lb/in.2 at sea level and 11.5 lb/in.2 at 5,000 ft, how fast is the atmospheric pressure changing with respect to altitude at an altitude of 15,000 ft? Give the answer to four decimal places.
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A. 0.0004 lb/in.2/ft
B. 0.0006 lb/in.2/ft
C. 0.0003 lb/in.2/ft
D. 0.0007 lb/in.2/ft
E. 0.0005 lb/in.2/ft
Answer: A
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