In 2011 a country's federal receipts (money taken in) totaled $2.38 trillion. In 2013, total federal receipts were $2.78 trillion. Assume that the growth of federal receipts, F, can be modeled by an exponential function and use 2011 as the base year (t= 0). 3) Find the growth rate k to six decimal places, and write the exponential function F(t), for total receipts in trillions of dollars. b) Estimate total federal receipts in 2015. c) When will total federal receipts be $11 trillion? 3) Find the growth rate k. k=j (Do not round until the nal answer. Then round to six decimal places as needed.)