document.write( "Question 327556: number of people who live alone has been increasing, as shown by the data in the given table\r
\n" ); document.write( "\n" ); document.write( "year / Number living alone (in millions)
\n" ); document.write( "_____________________
\n" ); document.write( "1970 / 10.0
\n" ); document.write( "1980 / 18.3
\n" ); document.write( "1985 / 20.6
\n" ); document.write( "1990 / 23.0
\n" ); document.write( "1995 / 24.7
\n" ); document.write( "2000 / 26.7
\n" ); document.write( "_____________________\r
\n" ); document.write( "\n" ); document.write( "Find a square root equation that's a reasonable model for this data. Let t represent the number of years after 1970. \n" ); document.write( "
Algebra.Com's Answer #234683 by Fombitz(32388)\"\" \"About 
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1970 / 10.0
\n" ); document.write( "1980 / 18.3
\n" ); document.write( "1985 / 20.6
\n" ); document.write( "1990 / 23.0
\n" ); document.write( "1995 / 24.7
\n" ); document.write( "2000 / 26.7
\n" ); document.write( "Square the data above to get,
\n" ); document.write( "1970/ 100
\n" ); document.write( "1980/ 334.89
\n" ); document.write( "1985/ 424.36
\n" ); document.write( "1990/ 529
\n" ); document.write( "1995/ 610.09
\n" ); document.write( "2000/ 712.89
\n" ); document.write( "Fit that to a straight line using EXCEL Chart Wizard,
\n" ); document.write( "\"y=20.136x-39552\"
\n" ); document.write( "Take the square root of that equation,
\n" ); document.write( "\"y=sqrt%2820.136x-39552%29\"
\n" ); document.write( "Check the data using the equation comparing to the original data,
\n" ); document.write( "1970/ 10.0/10.8
\n" ); document.write( "1980/ 18.3/17.8
\n" ); document.write( "1985/ 20.6/20.4
\n" ); document.write( "1990/ 23.0/22.8
\n" ); document.write( "1995/ 24.7/24.9
\n" ); document.write( "2000/ 26.7/26.8
\n" ); document.write( " \n" ); document.write( "
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