document.write( "Question 309919: Determine the midpoint between the points (-1,1) and (9,-1)\r
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\n" ); document.write( "\n" ); document.write( "A. (8,0)\r
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\n" ); document.write( "\n" ); document.write( "B. (5,0)\r
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\n" ); document.write( "\n" ); document.write( "C. (4,5)\r
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Algebra.Com's Answer #221672 by Alan3354(69443)\"\" \"About 
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Determine the midpoint between the points (-1,1) and (9,-1)
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\n" ); document.write( "Find the average of x and y separately.
\n" ); document.write( "x: (-1+9)/2 = 4
\n" ); document.write( "y: (1-1)/2 = 0
\n" ); document.write( "--> (4,0)
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