This problem requires the Pythagorean therom.
The distance between them is 7.
Since the distance between them is one more mile than ray's distance from home ray is 6 miles from home.
So rosa is [tex]\sqrt{7^2-6^2}[/tex]
So rosa is [tex]\sqrt{13}[/tex] miles away from home.
Rosa is about 3.6 miles from home.