SOLUTION: Have no idea how to answer this, need some help. A farmer has 40 metres of fencing with which to enclose his sheep. He wants to make a rectangular paddock. The farmer has permis

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Question 1094071: Have no idea how to answer this, need some help.
A farmer has 40 metres of fencing with which to enclose his sheep. He wants to make a rectangular paddock. The farmer has permission to use a river as one side of his enclosure, and still, has 40 meters of fencing available for the other 3 sides.
Use x to represent the width of the enclosure and write an expression for the length showing your working.
Answer by ikleyn(52788)   (Show Source):
You can put this solution on YOUR website!
.
Read the lessons
    - A rectangle with a given perimeter which has the maximal area is a square
    - A farmer planning to fence a rectangular garden to enclose the maximal area
    - A farmer planning to fence a rectangular area along the river to enclose the maximal area (*)
    - A rancher planning to fence two adjacent rectangular corrals to enclose the maximal area
in this site.

The lesson (*) contains exactly your problem.
The other lessons will make your horizon wider.