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I downloaded mathematica tonight so I can do an assignment. I have to modify a file our teacher posted on the class website, solve some equations and generate a curve... okay, this file ends in the extension nb. I need to know how to make the commands in the file execute. Now don't laugh. I put the cursor at the end of the line (for example a ParametricPlot command) and hit enter. I get a carriage return. My problem is so elementary that the help menus don't even address it.