Answer: Distance between Sarah's house and Amy's house is 7.6 miles.
Explanation:
Since we have given that
Distance at which Sarah lives west of Peter= 4 miles
Distance at which Amy lives south of Peter = 6.5 miles
Now, we need to find the distance between Sarah's house to Amy's house,
We'll use Pythagorus theorem,

So, Distance between Sarah's house and Amy's house is 7.6 miles.