3. The position of an object in kilometers after t hours is given by the function s(t) = +3 -8+2 + 12t + 20. Calculate the average velocity of the object on the interval [3, 3+h] for h - 2, 1, 0.5, 0.1, and 0.01. 4. Find each of these values (if they exist) for the piecewise function defined below. 4 if x 2 lim f (x) = x-2 lim f (x) = xx-2+ lim f (x) = x-2 f (2) =