![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
The list is 5, 9, 13, 17, ....
\Observe the pattern; the difference between consecutive numbers is 4.
\![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9650f15ca7ed2422c42ed39ec34a2a9b.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 + 4 = Next term.
\![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d914dd6c3e9d4087aa7f93888d60db60.png\")
(Substitute previous term = 17 and next term = n)
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1ace9cfedb6d9c6a22e73bf4ecfdd0ec.png\")
(Add: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1ecd2fa28861e74b1d7166b0b5c3e967.png\")
)
The extended pattern is
\![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=11f9374beb070f3113a09c4ccd21ddb0.png\")
The next term in the given list is 21.
\![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The next term in the given list is 21. \ \