Pls i need help 20 charscter

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

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?

What type of symmetry does a rhombus have?