The first term is  and 5th term is .

(Apply nth term of an arithmetic sequence formula: )

                   (Substitute )

                  (Substitute 16 for )

                (Add 4 to each side)

                               (Divide each side by 4)

                                       (Simplify)

First term is and common difference is d = 5.

(Apply nth term of an arithmetic sequence formula: )

                   (Substitute and 5 for d)

The nth term of the arithmetic sequence formula is .