Help me please

If sec theta = 5/3 and the terminal point determined by theta is in quadrant 4, then

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2

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?