How to write 400+5 in standard form

If jaime wants to find 60% of 320, which table should he use?

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?

Use pascal's triangle to find the missing values. x4 - 4xb + 6x2 - ax + 1