Step-by-step explanation:
coordinate of A is -3,-1
Tony's dorm is 7.5 miles far from the library.
Step-by-step explanation:
Given points are;
(4,0) and (12,6)

Using point distance formula;
Distance = 

One unit represents 0.75 miles, therefore,
10 units = 0.75*10 = 7.5 miles
Tony's dorm is 7.5 miles far from the library.
Keywords: distance, multiplication
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Are you looking for D on the graph? if so, then the final coordinate to complete the rectangle is (-2,-8)