1. maebee yu luv tu be frustrated, thats wot puter is for
2. ?? "chook pen" ??, wot du chook look like?
3. 15&50=750, not 800
4. I take it, yu wanna find biggest area yu kan get with 80 meters for 3 sides
me no anser: square...eech side=80/3, area=711.1111111...
5. yu don trust me?
length+2*wide=80, so leng=80-2*wide
area=length*wide=wide*(80-2wide)
=80wide-2*wide^2
tu find max or min, take derivativ...80-4wide
& set it tu 0...4(20-wide)=0
or wide=20, leng=40, area=800
the mistreeus math gremlins hit agin