![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
The list is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=11b7b0653a22a7bef19b3c9d35cea33f.png\")
Observe the pattern, the difference between consecutive numbers is 4.
\![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=967232a306a604ec98549844f500f626.png\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
Let n be the next term.
\Write an equation for the situation.
\Previous term ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=90a2dffa4cf28836c23bfcd658a94d29.png\")
4 = Next term.
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=f88ff95f76d1367dc5f899b4d6bb5825.png\")
(Substitute previous term = 21 and next term = n)
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4479431496e9aaaf69a4b1d8b4b318d7.png\")
(Subtract: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=99453c6eea97acb651335d8e0ded5270.png\")
)
The extended pattern is
\![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6305bf794d24ed7f7774bfd5f3a10173.png\")
The next term in the given list is 17.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The next term in the given list is 17.