document.write( "Question 429148: Carbon dioxide is a greenhouse \n" );
document.write( "gas in the atmosphere that may raise average temperatures \n" );
document.write( "on Earth. The burning of fossil fuels could be \n" );
document.write( "responsible for the increased levels of carbon dioxide. If \n" );
document.write( "current trends continue, future concentrations of atmospheric \n" );
document.write( "carbon dioxide in parts per million (ppm) could \n" );
document.write( "reach the levels shown in the accompanying table. The \n" );
document.write( "concentration in the year 2000 was greater than it \n" );
document.write( "had been at any time in the previous 160,000 years. \n" );
document.write( "CO2 \n" );
document.write( "sCO2d (a) Let x be in years, where corresponds to \n" );
document.write( "2000, to 2001, and so on. Find values for \n" );
document.write( "C and a so that models the data. \n" );
document.write( "(b) Graph f and the data in the same viewing rectangle. \n" );
document.write( "(c) Use to estimate graphically the year when \n" );
document.write( "the carbon dioxide concentration will be double \n" );
document.write( "the preindustrial level of 280 ppm.\r \n" );
document.write( "\n" );
document.write( "Table used: \n" );
document.write( "Year 2000 2050 2100 2150 2200 \n" );
document.write( "CO2 (ppm) 364 467 600 769 987 \n" );
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