Question

Which of the following expressions reperesents the distance between -13 and -4 on a number line?​

Answer 1

It is a.

Explanation:

The distance is | -13 - (-4)|

= |-9|

= 9

Answer 2

Explanation:

You've shared only possible answers a and c. What about b and d?

Answer a) is correct. The second - sign represents the difference between -13 and -4 (which is 7, by the way). -13 - (-4) works out to -13 + 4 = -9, and the absolute value of that is |-9|, or 9, the distance between -13 and -4.