I want to fence in a square vegetable patch. The fencing for the east and west sides costs $4 per foot, and the fencing for the north and south sides costs only $2 per foot. Find the total cost of the fencing as a function of the length of a side x.

Answer 1

total for east and west sides = 2 s*4 = 8 s
total for North and South sides = 2 s * 2 = 4 s
so total = $ 12 s

check ===> yes averaged out to $3 per foot :)