Barack walks 3 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.

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.