The expression is .
(Substitute x = 7.1, y = –2.5)
(Add: )
(Product of two same signs is positive)
(Add: 7.1 + 15.5 = 22.6)
The value of expression is 22.6.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
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.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4f03fb33498a97ad7f51983bc735aebe.png\")
(Substitute x = 7.1, y = –2.5)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=fd054344b59b60d81ad95b9cdf389210.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=bbdda301573fb9f2ce87543e84e4d2eb.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=3d8e4a6f9ac2255d35beabde65e3da32.png\")
(Product of two same signs is positive)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b009b51b746a450102d8d552eb948f18.png\")
(Add: 7.1 + 15.5 = 22.6)![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")