Determine the postate or theorem mustrated by each figure below are your answer.
​

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)

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?

Can someone, me with this.i really need with this