The Air Pressure P (H) (In Lb/ In ² )

Multiple Choice

The air pressure p (h) (in lb/ in ² ) at an altitude of h feet above sea level may be approximated by the formula At approximately what altitude h is the air pressure 9 lb/ in ² ?

A) 12,743 ft
B) 1,274 ft
C) 17,123 ft
D) 5,534 ft
E) 553 ft