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January 30, 2015

January 30, 2015

Posted by **tonya** on Sunday, April 5, 2009 at 11:49pm.

- business calculus -
**drwls**, Monday, April 6, 2009 at 2:40amVolume = pi r^2 h = 20 pi (m^3)

Therefore r^2 h = 20

h = 20/r^2

Cost = 2 pi r^2 * 10 + 2 pi r h * 8

= 20 pi r^2 + 16 pi r(20/r^2)

= 20 pi r^2 + 320 pi/r

Set the derivative with respect to r equal to zero.

40 pi r = 320 pi r^-2

r^3 = 80

r = 4.31 m

Check my math

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