# How can I solve it?

1. Oct 8, 2009

### r-soy

Hi all >>

How can I solve it?

A rectangular feeding pen for cattle is to be made with 100 meters of fencing .

Find :
1 - If X represents the width of the pen, express its area A(X) in terms of X
2 - What is the domain of the function A (determind by the physical restrictions ) ?

my regard

2. Oct 8, 2009

### Integral

Staff Emeritus
You need to show us some work.

Can you show us the formula for finding the area of a rectangle?

3. Oct 8, 2009

### LCKurtz

Start by drawing a picture, labeling the variable(s) and showing what you have tried.

4. Oct 8, 2009

### r-soy

Then what I do?

5. Oct 8, 2009

### Staff: Mentor

The attachment is pending approval, so we probably won't be able to see your drawing for several hours. What are the labels you put on each side of the rectangle? Keep in mind that you have 100 m. of fencing. What is the area of your rectangle? If you have labelled the sides correctly, you should have the area as a function of just one variable.

6. Oct 8, 2009

### r-soy

http://www.up-00.com/s1files/gv733764.jpg [Broken]

Last edited by a moderator: May 4, 2017
7. Oct 8, 2009

### Staff: Mentor

Can you label the sides of the rectangle using just a single variable? You're given a value for the perimeter.