The average monthly rent for a 1000-sq-ft apartment in a major metropolitan area from 1998 through 2005 can be approximated by the function below where t is the time in years since the beginning of 1998. Find the value of t when rents were increasing most rapidly. Approximately when did this occur? f(t) = 1.6131t4 19.344 +62.812 +6.6983t+ 1027 The rents were increasing most rapidly when t= (Do not round until the final answer. Then round to three decimal places as needed.) The rents were increasing most rapidly during the year