Solve the problem.
-An auxiliary fuel tank for a helicopter is shaped like the surface generated by revolving the curve $y = 1 - \frac { x ^ { 2 } } { 4 }$, $- 2$ $\leq x \leq 2$, 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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The Answer of Solve the problem.
-An auxiliary fuel tank for a helicopter is shaped like the surface generated by revolving the curve $y = 1 - \frac { x ^ { 2 } } { 4 }$, $- 2$ $\leq x \leq 2$, 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)?

Solve the Problem y=1−x24y = 1 - \frac { x ^ { 2 } } { 4 }y=1−4x2​

Solve the Problem $y = 1 - \frac { x ^ { 2 } } { 4 }$