For an arithmetic sequence where a1=5a_1 = 5a1=5 and d=2d = 2d=2, which formula gives the nthn^{th}nth term?
an=2n+5a_n = 2n + 5an=2n+5
an=2n+3a_n = 2n + 3an=2n+3
an=5n+2a_n = 5n + 2an=5n+2
an=2n+7a_n = 2n + 7an=2n+7