Tanapcalcbr9 5.6.005. - the world population at the beginning of 1990 was 5.3 billion. assume that the population continues to grow at the rate of approximately 2%/year and find the function q(t) that expresses the world population (in billions) as a function of time t (in years), with t = 0 corresponding to the beginning of 1990. (round your answers to two decimal places.)