To find the distance you can subtract the smaller number (the point that's on the left; numbers decrease as you go left on a number line) from the larger number.
Our points are 14 and -2. Subtract -2 from 14.
14 - (-2)
14 + 2 (two minuses equal a plus)
16
You can also determine this by counting by twos the number of ticks between the two points (since they increase/decrease by 2).
Answer:
16 units