You have the following coordinates for the Theather and for Kaleb home:
Theater (8 , 20)
Kaleb home (18 , 4)
In order to determine what is the possible location midway between them, you proceed as follow:
you sum x-coordinates and y-coordinates of eaxh point, and you divide by 2 the result of such addition:
Hence, the coordinates of a place miday between Theater and Kaleb home is (13 , 12).
You can notice tha the obtained point is near of Dave's Doorknobs
In a sketch of the graph you have: