148 CALCULUS AB
40. Suppose that f(x), f'(x), and f"(x) are continuous for all real numbers x, and that f has the
following properties.
I. fis negative on (-0,6) and positive on (6,00).
II. f is increasing on (-0,8) and decreasing on (8,00).
III. f is concave down on (-0, 10) and concave up on (10,co).
Of the following, which has the least numerical value?
(A) f'(6)
(B) ƒ"(4)
(C) ƒ"(10)
(D) ƒ"(12)
