Posted by **INEEDHELP!!!** on Monday, October 1, 2007 at 7:33pm.

a farmer wants to make a rectangular enclosure using a wall as one side and 120 m of fencing for the other three sides.

a) express the area in terms of x and state the domain of the area function

b)find the value of x that gives the greatest area.

my teacher didn't explain how to do this so im not sure, please help!

- pre-calc -
**bobpursley**, Monday, October 1, 2007 at 8:04pm
perimeter= 2s + l

120=2s + l

area= sl= s(120-2s)

Take the deriviative of area with respect to s, set to zero, and find s,l.

- pre-calc -
**bobpursley**, Monday, October 1, 2007 at 8:05pm
Oooppps. If you are in precal, you may not know derivative yet. In that case, graph A vs s, look for the max A, read where s is, then solve for l knowing s.

- pre-calc -
**Anonymous**, Monday, October 15, 2012 at 8:11pm
265wxjb

## Answer This Question

## Related Questions

- Calculus - A farmer has 120 meters of wire fencing to make enclosures for his ...
- math - Ex. 120 m of fencing is to be used to form three sides of a rectangular ...
- math - a farmer has 120 m of fencing to make two identical rectangular ...
- Calculus - A construction company wants to build a rectangular enclosure with an...
- Algebra - Suppose a farmer has 120 feet of fencing to make a rectangular ...
- Math - Suppose a farmer has 120 feet of fencing to make a rectangular barnyard ...
- Algebra - A builder has 80 feet of fencing to create an enclosure adjacent to a ...
- Pre-Calc - One campus of HCC has plans to construct rectangular parking lot on ...
- maths - A farmer has 120 metres of fencing. He is going to make a rectangular ...
- Math Calculus - Three sides of a fence and an existing wall form a rectangular ...

More Related Questions