Question

What is the midpoint of a segment whose endpoints are (–12, 8) and the origin?

Answer 1

the x value of the midpoint of 2 points is the average of the x values of those 2 points
the y value of the midpoint of 2 points is the average of the y values of those 2 points

so
(0,0) and (-12,8)
average
(0-12)/2=-6
(0+8)/2=4
so the midpoint is (-6,4)