Answer:
Ben's house is at point -2.
Explanation:
Anna lives 2.5 miles to the east.
And Ben lives 2 miles to the west.
Let 1 mile = 1 unit in x axis.
Where west is the negative axis and east is the positive axis. Also their school located at origin .i.e at x=0
From the attached figure we can see that Ben's house is at point -2.