document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=173132>Question 173132</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/9781567655568/algebrahomeworkh>Amsco's Preparing for the Regents Examination Mathematics B</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> 8. solve for x: (3 + 2i) + (4 + xi) = 7 - 5i\r<BR>\n" );
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document.write( "9. Which of the following is not sufficient to prove that a quadrilateral is a parallelogram?<BR>\n" );
document.write( "  (1) opposite sides are congruent  (2) opposite angles are congruent  <BR>\n" );
document.write( "  (3) diagonals are congruent  (4) consecutive angles are supplementary\r<BR>\n" );
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document.write( "Show work please, thank you! </SPAN>\n" );
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document.write( "(3 + 2i) + (4 + xi) = 7 - 5i\r<BR>\n" );
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document.write( "(3 + 4) + (2i + xi) = 7 - 5i\r<BR>\n" );
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document.write( "-----> 3+4 = 7 and 2i+xi=5i\r<BR>\n" );
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document.write( "2i+xi=-5i\r<BR>\n" );
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document.write( "xi=-7i\r<BR>\n" );
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document.write( "x=-7 <----answer\r<BR>\n" );
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document.write( "9)\r<BR>\n" );
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document.write( "Which of the following is not sufficient to prove that a quadrilateral is a parallelogram?\r<BR>\n" );
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document.write( "The answer is (4) consecutive angles are supplementary \r<BR>\n" );
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document.write( "Example:\r<BR>\n" );
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document.write( "Draw a trapezoid with the top and bottom parallel. Now make one side completely vertical. This will make 2 consecutive angles that add to 180, but it won't be a parallelogram </SPAN>\n" );
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