In Exercises 29-32 the graph of the second derivative, f"(x), is given. Determine the x-coordinates of all points of inflection of f(x), if any. (Assume that f(x) is defined and continuous every- where in [-3, 3].) [HINT: Remember that a point of inflection of f.corresponds to a point at which f" changes sign, from positive to negative or vice versa. This could be a point where its graph crosses the x-axis or a point where its graph is broken: positive on one side of the break and negative on the other.] 29. 30. >X 31. 32. X These are graphs of fl (x ) . Locate all inflection points