Volume with Rectangular Cross Sections
The region bounded by the graphs of $$y=x^2$$ and $$y=4$$ is the base of a solid. For this solid, cross sections perpendicular to the $$y$$-axis are rectangles whose height is twice the length of their base. What is the volume of the solid?
A
$$32$$
B
$$\displaystyle \frac{128}{3}$$
C
$$48$$
D
$$64$$
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