3. Find the average value of the function f (x) =- 16 2 over the interval [2, 4]. 0.2t 4. The population of a certain community t years after the year 2000 is given by P(t) =- 4 + e0.2t million people. What was the average population of the community during the decade from 2000 to 2010? Hint: Use u-substitution with u = 4 + e0.2t