Volumes by Disk and Washer Methods

AP Calculus AB· difficulty 3/5

x = y^2

A
$\pi\int_0^2 y^2\,dy = \dfrac{8\pi}{3}$
B
$\int_0^2 y^4\,dy$
C
$2\pi\int_0^2 y^2\,dy$
D
$\pi\int_0^2 y^4\,dy = \dfrac{32\pi}{5}$
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Explanation

x = y^2

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