Options for first 4 blanks:40m,-40m,-20m,0m,20mOptions for last 2 blanks:-100,100,-200,200,0

You are tasked with fencing off a rectangular area next to a river in order to protect a crop of Swiss chard from rabbits. You do not need to place fencing along the side of the region on the river, and the river bank is a straight line. Answer the following questions regarding maximizing the area enclosed by this fence, given that you have a total of 40m of fence. All numerical values should be treated as having two decimal places of precision. One side will be parallel to the river. It will be at least [ Select ] long and at most [ Select ] long. Two sides will be perpendicular to the river. Each will be at least [ Select ] long and at most [Select ] long. The minimum possible area for the fenced-off region is [Select ] m 2. The maximum possible area for this fenced-off region is [ Select ]