Please help meee!! I don’t understand this

So, we can see that from one number to another, there is a distance of 4 lines. To find how much those lines are actually equivalent to:
1 / 4 = 0,25
There is a distance of 0,25 between every line. Now, we count the lines from M to H. There are 13 lines, therefore, the distance is of:
0,25 * 13 = 3,25
Answer:
[tex]\boxed{\bf~3,25~units}[/tex]
Hope it helped,
BioTeacher101