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MZ Mai MZ Mai
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An auxiliary fuel tank for a helicopter is shaped like the surface generated by revolving the curve - 4 ≤ x ≤ 4, about the x-axis (dimensions are in feet).  If a cubic foot holds 7.481 gallons and the helicopter gets 3 miles to the gallon, how many additional miles will the helicopter be able to fly once  the tank is installed (to the nearest mile)?

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Textbook 

Calculus: Early Transcendentals


Edition: 3rd
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wanjigagawanjigaga
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