The number of enterprise instant messaging (IM) accounts is projected to grow according to the function N(t) = 2.94t2 + 11.32: + 59.3 (o s t s 5) where N(t) is measured in millions and tin years, with t = 0 corresponding to 2006. (a) How many enterprise IM accounts were there in 2006? (b) What was the expected number of enterprise IM accounts in 2010