QUESTION 27 For the given table, at what x-value listed below is the best estimate of f '( x) smallest? X W 5 7 9 11 13 f(x) W 9 14 18 20 21 0 9 0 5 O 11 QUESTION 28 An object is moving along a straight-line path. The table gives the position of the object (in feet, measured from some reference point) as a function of time (in seconds). t 2 4 6 8 10 S(t) 0 0.5 1.8 3.8 6.5 15.8 What is the average velocity of the object over the interval from t = 6 to t = 10 seconds? 5 ft/sec 12 ft/sec 4 ft/sec 3 ft/sec