The city council of a city of the metropolitan class shall have power to:

(1) Create any office or board deemed necessary;

(2) Discontinue any employment or abolish any office at any time when, in the judgment of the city council, such employment or office is no longer necessary;

(3) Fix the salary and compensation of all city officers and employees where such salary or compensation is not fixed or established by law; and

(4) Create a board of three or more members and confer upon such board powers not required to be exercised by the city council itself. The city council may require such other officers to serve upon any such board and perform the services required of it, with or without any compensation or additional compensation for such services or additional services.