The expression is .
(Substitute x = 7.1, y = –2.5)
(Apply assositative property: a + (b + c) = (a + b) + c)
(Subtract: )
(Add: )
The value of expression is 1.8.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=83250e79109b75ddcc31fda9e32dbe72.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8c9bfe0568909cce68929f33abdefea1.png\")
(Substitute x = 7.1, y = –2.5)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3d1639ca6f15a069e2127418d0263a0a.png\")
(Apply assositative property: a + (b + c) = (a + b) + c) ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2a95d24c41d00dffcac437d47ff71415.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=26838f49f82d8b968fa35731a4a25f37.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d32dd0e880c7619e25c21d1c71f56840.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=06baf2bc905e90c57161b8f2249a39a4.png\")
)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")