Question 3 (3 points) For the following graph: identify the regions/points that f(x) is not differentiable; explain. 5 4 Blood Sugar Levels 15 30 45 60 75 90 105 120 TimeQuestion 4 (3 points) For the following graph: identify the regions/points that f(x) is not differentiable; explain. + + X -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 14 1 2 3 4 5 6 7 8 9 10 + + +Question 8 [3 points} Use the following graph of fix] to describe the behavior off Ts]. State where f 'ixi is positive, negative, zero or not defined