Midpoint = ((x1 + x2)/2, (y1 + y2)/2)
where (x1, y1) are the coordinates of St Louis and (x2, y2) are the coordinates of Dallas.
The coordinates of St Louis are approximately (-90.2, 38.6) and the coordinates of Dallas are approximately (-96.8, 32.8).
Plugging these values into the formula, we get:
Midpoint = ((-90.2 + (-96.8))/2, (38.6 + 32.8)/2)
=((-187)/2, (71.4)/2)
=(-93.5, 35.7)
Therefore, the halfway point between St Louis, Missouri, and Dallas, Texas, is approximately (-93.5, 35.7).