A
this is an arithmetic sequence whose n th term ( explicit formula) is
[tex]a_{n}[/tex] = [tex]a_{1}[/tex] + (n - 1 )d
where d is the common difference and [tex]a_{1}[/tex] the first term
here d = 10 - 8 = 8 - 6 = 6 - 4 = 2 and [tex]a_{1}[/tex] = 4, hence
[tex]a_{n}[/tex] = 4 + 2(n - 1 ) = 4 + 2n - 2 = 2n + 2 → A
