(i) Identify the critical numbers of f. {Enter your answers as a commaseparated list.) x: (ii) dentify the open interva|(s) on which fis increasing or decreasing. (Enter your answer using interval notation.) increasing decreasing (iii) Determine whether fhas a relative maximum, a relative minimum, or neither at each critical number. {Enter your answers as a comma-separated list.) relative minimum x = relative maximum x =