The number line start from and moved 8 units to the right. So, 8 is positive.
The correct sum is .
The answer is A.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=eafa8b32bb7c8bf7fd9f2eff369bf09e.png\")
and moved 8 units to the right. So, 8 is positive. ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e811d5f92e6f951fe696902e5f284b22.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")