Answer:
the answer is 6
Step-by-step explanation:
a distance can not be neg . if you walk 15 feet backwards you still walked backwards 15 feet;you wont say "i walked -15 feet backwards".
the way the number line works is ,if you are finding the opposite of a negative number you go right of the 0, if not you go left, in this case you are finding the opposite of 6, so the distance is 6 since it cant be neg distance but the number on the line IS -6.
