The japanese 5 yen coin has a hole in the middle. if the diameter of the coin is 22 mm and the diameter of the hole is 5 mm, how would you calculate in terms of how much longer the outer edge is than the inner edge?

How many zeros does the function f(x)=4x3-x2+1 have

Select the two pairs of figures that are similar.

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?