Ling's vegetable patch is 4 meters wide and 6 meters long. Ling wants to build a fence around the vegetable patch. The fencing material costs $2.00 per meter. How much would it cost in total to build the fence?

The perimeter of the vegetable patch is:

P = 2(l + w) = 2(6 + 4) = 20 meters

Therefore, Ling needs 20 meters of fencing material. The cost would be:

20 meters x $2.00/meter = $40.00

It would cost $40.00 in total to build the fence.