Wednesday

April 1, 2015

April 1, 2015

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

**Answer this Question**

**Related Questions**

Calculus - A holding pen for fish is to be made in the form of a rectangular ...

calculus - a rectangular box is to have a square base and a volume of 20 ft ...

Calculus - A rectangular box with a square base and top is to be made to contain...

math - A rectangular box with a square base and top is to be made to contain ...

Algebra - 4. A shipping crate has a square base with sides of length x feet, and...

Calculus - A rectangular box with square base (which is NOT necessarily a cube) ...

Maths - Bill Ding plans to build a new hardware store. He buys a rectangular lot...

Calculus - An open top box with a square base is to be made so that it holds 3 ...

calculus - A box is contructed out of two different types of metal. The metal ...

Calculus - AM having problems understanding what equations to use for this word...