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October 21, 2014

October 21, 2014

Posted by **Luke** on Monday, November 23, 2009 at 1:30am.

For my answer I got:

radius: 49.6117

height (in this case length): 58.1962

Could someone confirm my answers? Thank you very much.

- Math, not "Chandra" -
**Writeacher**, Monday, November 23, 2009 at 9:45amAssistance needed.

Please type your__subject__in the**School Subject**box. Any other words are likely to delay responses from a teacher who knows that subject well.

- Chandra -
**drwls**, Monday, November 23, 2009 at 10:41amHow did you get those answers?

For a fixed volume, radius is a function of length.

(1/2) pi r^2 L = 225,000

L (r) = 450,000/(pi r^2)

Cost = L*2r*30 + pi*r^2*20 + pi*r*L*15

Write cost as a function of one variable and set the derivative equal to zero. Then solve for the unknown dimension.

If that is what you did, and no mistakes were made, than your answers are correct

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