Iwant to fence in a square vegetable patch. the fencing for the east and west sides costs $7 per foot, and the fencing for the north and south sides costs only $5 per foot. find the total cost of the fencing as a function of the length of a side x (feet).

The square has 4 sides: the north, south, east and west ones. Each side is x feet long, because the side of a square are all equal in length. We know the cost per foot for each side:

The total cost of the fence is the sum of the costs of the sides, so we have

So, if each side is x feet long, the fence will cost 24 times the length of each side.

the entire expression should be subtracted from 30. to subtract the quantity, distribute the negative sign, which changes the signs on the terms. so, the –2 changes to positive and gets added to 30 instead of subtracted from it.

hope this ! ^w^