5 is the answer to your question.
Answer: Second Option

Step-by-step explanation:
The formula for calculating the average rate of change between two values of x (
and
) is:

and
are the values of the function when
and 
In this case

Observe that when
,
and when
, 
Finally the average rate of change from 3 to 6 storms is:


Y=4x is the answers because four times three equals 12 so it works out
The answer is 50 hope this helped lol