6. The rate of change in revenue for Under Armour 8. Evaluate the definite integral. 2004 to 2009 can be modeled by -5x* dR 383.653 = 12.442+ + where R is the sale (in 2vx +9 dt millions) and t is the time (in years), with / = 4 corresponding to 2004. In 2005, the revenue for Under Armour was $8353 million. (a) Find a model for the revenue for Under Armour. 5x 9. Jo dx I+x (b) Find the revenue for Under Armour in 2008