Find the height of a sharp-crested free-flow rectangular weir to pass a discharge of 0.4 m/s with an upstream depth of 1.0 m. The width of the weir is 2.0 m and is equal to the width of the channel. Answer choices:
5x-9
6x+20
6x^2-23x+20
6x^2-14x-9

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?