Which number below is a prime number?

31

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If g(x) is an odd function, which function must be an even function?

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?

If f (x) = 2x2 +5/(x-2), complete the following statement: f(6) =