We have to find the length in between the two points. To do so, we take the absolute value of the points and add them together.
Point A is at -10. The absolute value of -10 is 10. (Absolute value: any value inside these: || = positive. Ex: |-10| = 10)
Point B is at 4.
Add both numbers together.
10 + 4 = 14
Another easier way to solve is to count the spaces in between -10 and 4. You would still get 14 as your answer if you do this.