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**icelated** Basically, what i have is

$\displaystyle V = 2 \pi \int _{o}^ {4} (4-x) \, \sqrt x \, dx $

would i then distribute?

$\displaystyle V = 2 \pi \int _{o}^ {4} (4x^{1/2} -x ^{3/2} ) dx$

Then, integrate?

$\displaystyle 2 \pi \int _{o}^ {4} (4 * \frac {2} {3} x^{3/2} - \frac {2}{5} x ^{5/2} $

then,

$\displaystyle 2 \pi [ \frac {8} {3} x^{3/2} - \frac {2}{5} x ^{5/2}] $

evaluated from 0 to 4

Is this correct? I cant seem to get a decent answer. Wolfram gives me weird steps and an answer i cant match...And when would i do something with the 2pi? Do i use 2pi for each side?