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How do you use the elimination method for this question? explain, because i really want to understand!

Which graph represents the parent function of y=(x+2)(x-2)

Three baby penguins and their father were sitting on an iceberg 0.50.50, point, 5 meters above the surface of the water. the father dove down 4.74.74, point, 7 meters from the iceberg into the water to catch dinner for his kids. what is the father penguin's position relative to the surface of the water?