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Quadrilateral problems on the coordinate plane

You are graphing Rectangle ABCDABCD in the coordinate plane. The following are three of the vertices of the rectangle: A(7,7.5),B(3,7.5),A(-7, -7.5), B(-3, -7.5), and C(3,2.5)C(-3,2.5).
What are the coordinates of point DD?
(\large(
  • Your answer should be
  • an integer, like 66
  • an exact decimal, like 0.750.75
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
,
  • Your answer should be
  • an integer, like 66
  • an exact decimal, like 0.750.75
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
)\large)