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An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image

What is the range of the inverse of the given function f(x)=√x-2