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houston1980
In the xy-plane, the coordinates of two vertexes of parallelogram are (3,8) and (3,12) . What are the co-ordinates of the forth vertex?

1. The coordinates of the third vertex are (6,9)
2. The coordinates of the forth vertex are positive.

The forth vertex coordinates can be (6,13) or (6,5).

Therefore the answer is E. Statement 1 and Statement 2 are NOT sufficient.
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The key to solving the problem is to distinguish cleraly between a square, a rectangle and a parallelogram
state 1 :

The coordinates of the fourth point can be can be (6,13) or (6,5).
depending on whether it was closer to (3,8) and (3,12) respectively
insuff
state 2 :
The coordinates of the forth vertex are positive
highly insuff
even combined we are not able to arrive at a correct conclusion
Hence IMO E
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