Keshawn needs to enclose a pen for her pigs. She only has 200 feet of fencing and wants to enclose the maximum area. She sets up a equation A = l (100-l) to find the length of the pen should be. What does 100 - l represent?

24.51 kg round this to 1 decimal

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A species' population dropped from 2000 in the year 2000 to 1200in the year 2011. Find the percent decrease in its population