I don't know where to start please help!

3. [5 marks] The pollution concentration (in parts per million) t hours after a steel factory ceases operations for the day is m by or) = 2(:\"f;;:) [Recalh The average value of a function f (m) on the interval [(1, b] is given by favg = f: f (1:)dz] . Determine the average pollution concentration, to 2 decimals, from t = 0 to t = 5 hours