The arithmetic sequence is .
(Apply common difference formula: )
(Simplify)
The common difference of sequence is 0.4.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=77ff119db8e5c68fdf2da11a8173c1f0.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=794b25035616a3a3c9301a0a42ac4197.png\")
(Apply common difference formula: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7d9d3bf4ec86f42f06196024de3e598e.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=110ef102b77bf0b201f90a30227b6682.png\")
(Simplify) ![\"\"](\"/userfiles/image/steps_images/solution.JPG\")