82,321 to the nearest hundred ?

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air

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?

Solve for x where 0 equation: cot^2x+2cotx+1=0