A fence is to be built to enclose a rectangular area of 310 square feet. The fence along three sides is to be made of material that costs 3 dollars per foot, and the material for the fourth side costs 14 dollars per foot. Find the dimensions of the enclosure that is most economical to construct.

Answer 1

see

http://www.jiskha.com/display.cgi?id=1418350095

Answer 2

now i need to buy my materials to fence my yard. using the dimensions above,what would i pay if each foot of fencing costs $12? write an equation and solve