Could you help me with these problems

H1. If/(x)=x3 - 6x2 +5 find al Critical numbers of f if any. b) Open Intervals where / Is Increasing or / Is decreasing. c) Local maxima or local minima if any. H2. If/(x)= x /3(x2 - 4) find a) Critical numbers of f if any. b) Open intervals where / is increasing or f is decreasing. () Local maxima or local minima If any. H3. If f(x) = - find x+1 a) Critical numbers of f If any. b) Open intervals where / is increasing or f is decreasing. c) Local maxima or local minima If any. H4. Iff(x)=2x*+9x + 12x -4 determine open intervals where / is concave up or / is concave down. H5. If(x)= x - Inx determine open Intervals where f is concave up or f is concave down. H6. If/[x) = determine open Intervals x41 where f is concave up or / is concave down