What is the center of the circle given by the equation x^2+y^2-14y-15=0

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An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

Terri makes a quilt using three sizes of fabric squares the side lenght of each fabric square is the square root of the area