document.write( "Question 1055206: Please help with quadratic formula problem.\r
\n" ); document.write( "\n" ); document.write( "Find a quadratic model that represents the data with \"+t+=+4+\" corresponding to 1994. Which of the following functions best represents the data using a quadratic model? \r
\n" ); document.write( "\n" ); document.write( "Model: https://s3.postimg.org/fxhkdbw2r/internet_access.png \r
\n" ); document.write( "\n" ); document.write( "A.) f(x) = 1.91x^2 + 12.21x + 20.74
\n" ); document.write( "B.) f(x) = 1.91x^2 - 12.21x + 20.74
\n" ); document.write( "C.) f(x) = 12.63x - 16.53
\n" ); document.write( "D.) f(x) = 12.63x - 54.42 \n" ); document.write( "
Algebra.Com's Answer #670416 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "1994   3\r\n" );
document.write( "1995   8\r\n" );
document.write( "1996  14\r\n" );
document.write( "1997  27\r\n" );
document.write( "1998  51\r\n" );
document.write( "1999  63\r\n" );
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document.write( "On your TI-83 or TI-84 graphing calculator:\r\n" );
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document.write( "Press STAT\r\n" );
document.write( "Press ENTER\r\n" );
document.write( "Enter 4,5,6,7,8,9 in L1 and 3,8,14,27,51,63 in L2.\r\n" );
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document.write( "Press 2ND STAT\r\n" );
document.write( "Highlight CALC\r\n" );
document.write( "Scroll down to QuadReg\r\n" );
document.write( "Press ENTER several times until you see\r\n" );
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document.write( "y=a2+bx+c\r\n" );
document.write( "a=1.910714286\r\n" );
document.write( "b=-12.21071429\r\n" );
document.write( "c=20.73571429\r\n" );
document.write( "R2=.983826542\r\n" );
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document.write( "One of your answers has these coefficients a,b, and c\r\n" );
document.write( "rounded off to 2 decimal places.\r\n" );
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document.write( "Edwin

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