Christianity is the largest and most popular religion in the United States, with around 77% of those polled identifying themselves as Christian, as of 2009.

The domain of a function is the set of all possible input values (often the "x" variable), which produce a valid output from a particular function; the set of all real numbers for which a function is mathematically defined.

Added 5/1/2014 5:26:04 AM

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