We are given the initial pressure P = 130 lb/in², initial volume Vi = 400 in³, and final volume Vz = 900 in³. We need to convert these values to feet.
1 ft = 12 in, so 1 ft² = 144 in² and 1 ft³ = 1728 in³.
P = 130 lb/in² = 130 lb/144 ft² = \frac{65}{72}
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