Question: OFFICE VACANCY RATE The total vacancy rate (in percent) of offices in Manhattan from 2000 through 2006 is approximated by the function
R(t) = 0.032t4 - 0.26t3 - 0.478t2 + 5.82t + 3.8 (0 ≤ t ≤ 6)
Where t is measured in years, with t = 0 corresponding to 2000. What was the average vacancy rate of offices in Manhattan over the period from 2000 through 2006?