The rate of change in revenue for under armour from 2004 through 2009 can be modeled by dr dt = 13.897t + 284.653 t where r is the revenue (in millions of dollars) and t is the time (in years), with t = 4 corresponding to 2004. in 2008, the revenue for under armour was $725.2 million.† (a) find a model for the revenue of under armour. (round your constant term to two decimal places.) r(t) = 6.9485t2+284.653ln(t)−311.42 (b) find under armour's revenue in 2006. (round your answer to two decimal places.)