Find the Volume of the Described Solid $x$ -Axis At $x = 0$

question 66

Multiple Choice

Find the volume of the described solid.
-The solid lies between planes perpendicular to the $x$ -axis at $x = 0$ and $x = 9$ . The cross sections perpendicular to the $x$ -axis between these planes are squares whose bases run from the parabola $y = - 2 \sqrt { x }$ to the parabola $y = 2 \sqrt { x }$ .

• A) 162
• B) 648
• C) 324
• D) 640

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