Answer:
The answer to your question is: 7.28 miles
Step-by-step explanation:
data
H (2, 7)
S (-5, 5)
1 map unit = 1 mile
Formula
d = √((x2-x1)² + (y2-y1)²)
d = √(-5-2)²  + (5- 7)²
d = √ (-7² + -2²)
d = √ 49 +4
d = √53
d = 7.28 units
But
          1 unit ----------------  1 mile
       7.28 units -------------   x
 x = 7.28 x 1/1 = 7.28 miles