The graph shows the number of births in some​ country, in​ millions, from​ 1970-2005.Here C(t) represents the number of Caesarean section​ births, B(t) the number of​ non-Caesarean section​ births, and​ N(t) the total number of births in year t. Use estimates of ​B(19851985​) and ​C(19851985​) to estimate ​N(19851985​). Assume the values are to the nearest tenth.