QUESTION 12 Suppose the velocity of a skateboarder over a 10 second interval is given in the table below: t 0 2 4 6 8 10 f(t) 30 17 15 11 7 1 where time is in seconds and f(t) is given in feet / second . Determine the lower estimate (underestimate) for the total distance traveled over the 10 second interval. 51 ft O 102 ft O 160 ft 131 ftQUESTION 13 Find the derivative of the function f(x) = 2x + ex sing(x) (6x2 + e* )sinx - (4x3 + 2e* )cosx sin x 0 6 x2 + ex 2sinx O 6 x2 + ex 2sinxcosx (6x2 + e* )sinx - (4x3+2e* )cosx sin*x QUESTION 14 Find the area bounded between the graphs of y = x & y = 10x O -85.33 O -166.67 O 166.67 85.33