The amount of freight transported by rail in the u. s was about 580 billion ton-miles in 1960 and has been increasing at a rate of 2.32% per year since then. a. write a function representing the amount of freight, in billions of ton-miles, transported annually. ( 1960 = year 0 )

b. graph the function

c. in what year would you predict that the number of ton-miles would have exceeded or would exceed 1 trillion (1,000 billion)?​