QUESTION 13 Refer to the function f in No. 5. In what intervals is the graph of f concave downward? 12 12 5 12 12 5 5 O 12 5 O 12 5 QUESTION 14 Which of the following statments is false? O The local extrema off, if there are any, always occur at the critical numbers of f. The absolute extrema off may occur at the endpoints of the interval where f is defined. O Iffis continuous on the closed interval [a, b], then f has absolute extrema on [a, b]. O If g is continuous on the closed interval [a,b], then there exists a number c in (a,b) such that g (c) = 0