Complete question 4 please

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) = x - 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) (7) fly) In x