Posted by **Nahel** on Tuesday, August 5, 2008 at 8:59pm.

A rectangular lot is to be bounded by a fence on three sides and by a wall on the fourth side. Two kinds of fencing will be used with heavy duty fencing selling for $4 a foot on the side opposite the wall. The two remaining sides will use standard fencing selling for $3 a foot. What are the dimensions of the rectangular plot of greatest area that can be fenced in at a cost of $6600?

THANK YOU!!!

- word problem? -
**Damon**, Tuesday, August 5, 2008 at 9:19pm
cost = 6 b + 4 L = 6600

area = b L

so

4 L = 6600 - 6 b

L = 1650 - 1.5 b

area = y = 1650 b - 1.5 b^2

that is a parabola opening down, the maximum will be at the vertex

find the vertex

1.5 x^2 -1650 x = -y

x^2 - 1100 x = -2 y/3

x^2 - 1100 x + 302500 = -2 y/3 + 302500

(x-550)^2 = -2 y/3 + 302500

x = b = 550

so L = 1650 - 1.5 (550)

L = 825

## Answer This Question

## Related Questions

- Calc. - A rectangular plot of land is to be fenced in using two kinds of fencing...
- Math: Word Problem - A security fence encloses a rectangular are on one side of ...
- Algebra - a rectangular lot whose perimeter is 1600 feet is fenced on three ...
- college algebra - a rectangular lot whose perimeter is 440 feet is fenced along ...
- Allan Hancock College - A rectangular lot whose perimeter is 260 ft is fenced ...
- fdr - a rectangular fence is constructed that will enclose 100 ft sq of land. ...
- IMPORTIANT MATH - A school is fencing in a rectangular area for a playground. It...
- Business Calculus - Bill wants to fence in his rectangular garden so his ...
- pre-cal - One campus of Houston community college has plans to construct a ...
- college Algebra - A rectangular fence is to be built along a river using the ...

More Related Questions