please help me out with this questions

2 Determine the nature of the stationary and inflexion points (if any), and verify your inflexion points by using other approaches for the following functions: (a) f(x) = xe ( b ) f ( x ) = /x ( x+ 1 ) . (c) f (x) = (x-1)5+1. used Sketch the graphs by showing all the stationary and inflexion points. Comment on the approaches