The rectangular playing area of a professional football field is 100 yards long. The perimeter of the playing area is 920 feet. The formula for the perimeter of a rectangle is P = 2l + 2w. What is the width of the playing area? 1. In the perimeter formula , l is the length and w is the width. a. Name the variables in the formula. b. Look at the problem. Which variables are known? Which are unknown? c. Complete the sentence to describe the relationship between l, w, and P in words. If you know l and w and want to find P,

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