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ttps:// w w w.webassign.net/web/StudentAssignment-Responses/submit?dep 190 08 384 #Q4 ■Students-Friend Sign In N Netflix·Spotify Pinterest CafeMov the following fx)-7x+21x +2 (a) Find the critical numbers of f. (Enter your answers as a comma-separated list.) (b) Find the open intervals on which the function is increasing or decreasing. (Enter your answers using interval notation. If an answer does not exist, enter DNE increasing t-1u) (c) Apply the First Derivative Test to identify the relative extremum. (If an answer does not exist, enter DNE.) (x, n-(BN relative maximum Consider the following function rs using interval notation. If an answer does not exist, enter DNE.) or