two friends leave school at the same time, sarah is heading due north and beth is heading due east. one hour later they are 10 miles apart. if sarah has traveled 8 miles from the school, how many miles had beth teaveled?

a. 8 miles.
b. 10 miles.
c. 2 miles.
d. 6 miles.

C. 2

If Sarah travelled 8 and their difference is 10 v can simply subtract 10 - 8= 2.

EDIT!!!
my bad.. Sorry.. Above answer is incorrect.
FOLLOWING IS THE CORRECT ANSWER! (I apologize)
So if Sarah travelled north and Beth travelled east, consider them being at 2 ends of a triangle.
Since they both sre 10 miles apart, consider the hypotanious to be 10. And Beth has travelled 8 gives us that one side of the triangle is 8.
Therefore by applying Pythagoras theorom,
10²- 8² = x²
100-64=x²
36 =x²
6 =x