posted by Anonymous .
Suppose that f(x), f'(x), and f''(x) are continuous for all real numbers x, and the f has the following properties.
I. f is negative on (-inf, 6) and positive on (6,inf).
II. f is increasing on (-inf, 8) and positive on 8, inf).
III. f is concave down on (-inf, 10) and concave up on (10, inf).
Of the following, which has the smallest numerical value?