The perimeter of a rectangle changes from 2.5 to 10 after a dilation. what was the scale factor of the dilation? 2 4 7.5 12.5

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When solving this problem: 3025/5.5 = a/90.75 you get 49912.5 which would be the length of one of the sides of a square when the area is only 90.75 inches. is that answer correct, why, and how is it possible?

What is the distance between the points (2, 5) and (5,9)?