HELP

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Which one ? is the answer and how to find this answer

The diagonals of a quadrilaretral intersect at (-1,4). one of the sides of the quadrilateral is bounded by (2,7) and (-3,5) determine the coordinates of the other side in order for the quadrilaretral to be a square.

1. how do you convert the repeating, nonterminating decimal 0. to a fraction? explain the process as you solve the problem.