Answer:
11
Step-by-step explanation:
Answer:
<h2>The value of

is 31 years.</h2>
Step-by-step explanation:
The given equation is formed by different variables, where
indicates the period of time in years where the rate of inflation is calculated.
In this case, we have a period from 1980 to 2011. The difference between these years would be the period of time used to find the inflation rate.

Therefore, the value of
is 31 years.
Answer:
D. Vertical Angle is the correct answer
Where is the proof you need help with?