It is the arabic system of numbers. The Roman was the one with Xes and Vs and Is and many other types of markings. Arabs used the 1-9 system, while 0 was taken from the hindu system as it indicates an empty space, so we got the 0-9 system that is commonly used now.
Answer:
31
Step-by-step explanation:
Answer: 
Step-by-step explanation:
To find the midpoint, you use the formula
.
The points are (-2,-1) and (4,-2).
[add]
[divide]

Now, we know the midpoint is
.