Question

Barack walks 2 kilometers south and then x kilometers east. ​ ​He ends 5 kilometers away from his starting position. ​ ​ Find x rounded to the nearest tenth of a kilometer. ​

Answer 1

So this is a Pythagorean problem where
A^2+b^2=c^2

a is 2
X is b
5 is c

Plug that into the equation and get

4+b^2=25

B^2=21
B=sqrt(21)=4.6kilometer