Answer:
Step-by-step explanation:
arithmetic sequences can be written as
[tex]a_n = a_1 + (n-1)d\\[/tex]
in this case
[tex]a_n = a_1 + (n-1)(-3)\\and\\17 = a_1 +(4-1)(-3)\\17= a_1 + (3)(-3)\\17= a_1 - 9\\a_1 = 26\\so\\a_n = 26 - 3(n-1)\\a_n = 26 -3n + 3\\a_n = 29 - 3n[/tex]
