For questions (1)-(7), determine the interval(s) on which f(x) is concave up and on which f(x) is concave down AND indicate where f(x) has inflection point(s). (If there are none, please say so).

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) =xex (6). f(x) = In(x4 +27) In x (7) . f ( x) =x