document.write( "Question 135067: What is the difference between domain and range? Describe a real-life situation that could be modeled by a function.\r
\n" ); document.write( "\n" ); document.write( "Can someone explain this so I can understand it? \n" ); document.write( "

Algebra.Com's Answer #98893 by vleith(2983) $\"\"$ $\"About$

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The domain is the set of all valid value for the 'independent' variable. The range is the set of the resulting 'dependent' variable.\r
\n" ); document.write( "\n" ); document.write( "So, let's say you had a function like $\"y+=+5+%2B+2x\"$
\n" ); document.write( "Then the domain is the set of all valid values for x and the range is the values you would get for all the 'y' when you subbed in all the 'x's.\r
\n" ); document.write( "\n" ); document.write( "As far a a function goes, let's say you want to go to a local theme park. Tickets are $25 and parking is $10.\r
\n" ); document.write( "\n" ); document.write( "The total price for a family is given by $\"P+=+25a+%2B+10\"$ where a is the number of people in the family.\r
\n" ); document.write( "\n" ); document.write( "For that function the domain is all values of 'a' that are positive (no family has 0 or negative number of members).\r
\n" ); document.write( "\n" ); document.write( "The range is (35, 60, 85, 110, etc... like that) \n" ); document.write( "

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