Answer:
Doreen is within the radius of the tower (at the limit).
Step-by-step explanation:
(Assuming that the first 15 miles is East or West)
We can calculate Doreen's distance to the tower using Pythagoras theorem, as these coordinates form a triangle with a 90 degrees angle:
Distance^2 = 15^2 + 8^2
Distance^2 = 225+64
Distance^2 = 289
Distance = 17 miles
Doreen is at 17 miles from the tower, and the tower range is 17 miles, so Doreen is within the radius of the tower (at the limit).
