Answer:
$448 million
Step-by-step explanation:
When it is 2011, t=11, so

Answer:
The amount of interest payable after 6 months is $28.
Step-by-step explanation:
Here, the Principal amount borrowed = $400
Rate of Interest = 14%
Time = 6 months = 6 / 12 years = 0.5 year
Now, SIMPLE INTEREST = 
So, here SI = 
or, SI = $28
Hence, the amount of interest payable after 6 months is $28.
So firstly, we have to find f(x) when x = 8 and x = 0. Plug the two numbers into the x variable of the function to solve for their f(x):

Now that we have their y's, we can use the slope, aka average rate of change, formula, which is
. Using what we have, we can solve it as such:

In short, the average rate of change from x = 0 to x = 8 is 5/21.