Part 2#
Practice (need help with 1 2 and 3)

If the value of cos330°is√3/2 then find cos 165°.

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?

Which equation can be solved to find x the measure of jk in the apex