Answer:
divide the least common denominator by the original denominator
The formula of a distance between two points A and B is :

You should this formula by heart.
Then, you just have to apply it ! :D
Here :




Therefore :




In short, the answer would be the first option :

.
Hope this helps !
Photon
Answer:9
Step-by-step explanation:
-2x+8=-10
-2x=-18
X=9