X/3+10=35 how do you do this equation

Which of the following are parts of a sphere

Landon wrote that 3−2.6=4. which statement about his answer is true?

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?