Jon Stafford (? 3), where t= 3 corresponds to 2003 and f(t) is in billions of dollars. Find the revenue in the given years below. (a) 2006 (b) 2007 (c) If the function remains accurate, what will the revenues be in 2013? (a) In 2006, the total revenues were approximately $ billion. (Round to two decimal places as needed.)