Posted by **phil** on Sunday, November 9, 2008 at 9:13am.

can someone help me with this question. I am completely stuck.

A box with a quare base and top has a volume of 20 meters cubed. The material for the base costs $7.00 per sq. meter, the material for the sides costs $4.00 per sq. meter, and the material for the top costs $2.00 per sq. meter. Express the cost of the materials used to build the box as a function of the width x of the base.

- math -
**drwls**, Sunday, November 9, 2008 at 9:18am
If the width of the box is x, and the volume is 29 = x^2 h, then the height h is 20/x^2.

Write a formula for the side area, the top area and the bottom area in terms of x only.

Finally, write another formula that adds up the costs of all sides.

## Answer this Question

## Related Questions

- Math - A rectangular box is to have a square base and volume of 78 feet cubed. ...
- math - A rectangular box is to have a square base and a volume of 30 ft3. The ...
- math - A rectangular box is to have a square base and a volume of 50 ft3. The ...
- Math-Optimization - The material for the base of a box will cost three times as ...
- Calculus - A rectangular box is to have a square base and a volume of 20 ft3. ...
- calculus - A rectangular box is to have a square base and a volume of 50 ft3. ...
- calculus - A rectangular box is to have a square base and a volume of 50 ft3. ...
- calculus - A rectangular box is to have a square base and a volume of 50 ft3. ...
- calculus - A rectangular box is to have a square base and a volume of 50 ft3. ...
- Calculus - A rectangular storage container with an open top is to have a volume ...

More Related Questions