Answer:
4.1m
Explanation:
You need to draw a diagram to make it more clear.
Since you know that Jackie is south of Katy and west of Scott, you will find that the distance between Scott and Katy is the hypotenuse of the triangle. Therefore, you can solve the problem like this:
c^2 = a^2 + b^2
a^2 = c^2 - b^2
a^2 = 9^2 - 8^2
a = √17
a = 4.1