<PRE><B>Question 173132</B>
8. solve for x: (3 + 2i) + (4 + xi) = 7 - 5i
7 + (2+x)i = 7 - 5i
2+x = 5
x = 3
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9. Which of the following is not sufficient to prove that a quadrilateral is a parallelogram?
  (1) opposite sides are congruent  (2) opposite angles are congruent  
  (3) diagonals are congruent  (4) consecutive angles are supplementary

Draw the pictures of the various conditions; see if you get a parallelogram
under each condition.
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Cheers,
Stan H.
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