a radio controlled car rolls 10 m south, then reverses direction and rolls 8 m north. the car has traveled a distance of 18 m and has a displacement of ___ m south.
Think of south as negative and north as positve, and since it's distance, you're answer is going to be the absolute value. It goes to -10, then add 8. It's -2, which means 2 miles south.
+229 
