Phrase: Four dollars less than the cost of the sweater.
Variable: Let represents the cost of the sweater.
Expressions: .
Therefore, the algebraic expression is .
The algebraic expression is .
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=397fa06c87524875a08b8582b661eb47.png\")
represents the cost of the sweater.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3d619e7f82e13e7e4e9955e1c65cdcf1.png\")
..![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
.