document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1195886>Question 1195886</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Read the description of the below relation and decide whether it is a function.\r<BR>\n" );
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document.write( "An engineer tests different models of cars to determine which car has the best mileage. He records the miles per gallon of each model of car. </SPAN>\n" );
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document.write( "This one is not defined well enough.<br><BR>\n" );
document.write( "If the engineer tests a single car of each model type (not a very good way!), then each model type will have a single value for the mpg, and the relation will be a function.<br><BR>\n" );
document.write( "If the engineer performs a reasonable test to compare mpg for different models of cars, then the relation will not be a function, because the mpg values for different cars of a given model type will (almost certainly) be different.  One input (model type) with difference outputs (mpg) means it is not a function.<br><BR>\n" );
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