How can you use a number line to find the sum of -4 and positive 6

How do i put 3(x+7) in distributive property

Can someone me with my math problems i have a bunch. i will give brainliest and lots of pleeeaaasssee

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?