A national census bureau predicts that a certain population will increase from 34.4 million in 2000 to 63.2 million in 2080. Complete parts (a) through (c) below (a) Find an exponential function of the form f(t)-yob' for these data, in which t=0 corresponds to 2000 and 1(t) is in millions (Use integers or decimals for any numbers in the expression. Round to four decimal places as needed.)