For Questions (1)-(7), determine the interval(s) on which f(x) is concave up and on which f(x) is con- cave down AND indicate where f(x) has inflection point(s). (If there are none, please say so). (1). f(x) =x3 - 12x +1 (2). f(x) = x4 - 2x2 + 3 (3). f(x) = x4 - 6x2 (4). f(x) = 3x5 - 5x3 +3 (5). f(x) = xe* (6). f(x) = In(x# + 27) (7). f ( x ) = - In x VX