You can
put this solution on YOUR website!She is 4 miles north & 6 miles east of her starting location.
Thus you have a right triangle with sides of 4 & 6 miles and need to find the hypotenuse.
a^2+b^2=c^2
4^2+6^2=c^2
16+36=c^2
52=c^2
c=sqrt52
c=7.211 miles is her distance from her starting point.