If you graphed this equation y=x-3 you would get a line that crosses the y-axis at -3 and slants up to the right at a slope of 1/1. There would not be anything that blocks it from going higher or lower at any point so, its range is "All Real Numbers."
The EPA range estimate for the 2009 BMW X3 is 283.2 mi. in the city, 407.1 mi. on the highway.
The EPA range estimate for the 2004 BMW X3 is 265.5 mi. in the city, 389.4 mi. on the highway.
The EPA range estimate for the 2007 BMW X3 is 283.2 mi. in the city, 424.8 mi. on the highway.
The EPA range estimate for the 2008 BMW X3 is 283.2 mi. in the city, 407.1 mi. on the highway.
The EPA range estimate for the 2006 BMW X3 is 265.5 mi. in the city, 407.1 mi. on the highway.
The EPA range estimate for the 2010 BMW X3 is 300.9 mi. in the city, 424.8 mi. on the highway.
The EPA range estimate for the 2014 BMW X3 is 371.7 mi. in the city, 495.6 mi. on the highway.
The EPA range estimate for the 2011 BMW X3 is 336.3 mi. in the city, 442.5 mi. on the highway.
The EPA range estimate for the 2012 BMW X3 is 336.3 mi. in the city, 442.5 mi. on the highway.
The EPA range estimate for the 2005 BMW X3 is 265.5 mi. in the city, 389.4 mi. on the highway.
The EPA range estimate for the 2013 BMW X3 is 371.7 mi. in the city, 495.6 mi. on the highway.
It could be the Real numbers or it could be the Complex plane.