If a string is 38 millimeters long, how many meters long is it? (1 millimeter = 0.001 meter)
0.038 meters i think it's this one.
0.38 meters
3.80 meters
38.0 meters

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)

(23*2)-12=x     x=34

step-by-step explanation: