Giving brainliest For best answer

4 because above the number 0 there is 4 dots :/ I don't have another explanation.

4 of them dont have brothers or sisters

Step-by-step explanation:

there are 4 dots at the 0 on the plot so 4 of them don't have siblings :)

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)