Answer :
Your answer is C: 6 because you always want to go awaay from negatives and go to the positives.
well if it is 13 units away it could be both 13 to the right and 13 to the left so....you add 13 to -7:6 so you get 6 meaning c is an option and now subtract 13 from -7 giving you -20 so d is also an option answer: C and D