Apaper published in a medical journal reported that about 11/25 of girls ages 16-17 do not exercise at all. the entire study consisted of about 2, 500 girls. about how many did not exercise?

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)

correct answers below: