Add the x's
SO 3x=18
divided by 3
So x=3
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:


Answer:
x= 27/2
Step-by-step explanation:
The answer is C. Hope this helps! :)