The value would be 829.89.
The formula we use is

,
where A is the total amount, p is the principal, r is the rate expressed as a decimal number, n is the number of times per year the interest is compounded, and t is the number of years.
We will use 800 for p; 5.25/100 = 0.0525 for r; 365 for n; and (255/365) for t (since it is not a full year):
The answer is 221,448,757.5
Remember to use PEMDAS
Assuming you are focusing on the square only, then the answer is 9 inches.
You take the square root of 81 to get 9. Notice how 9^2 = 9*9 = 81. So if you're not familiar with square roots, then think backwards in a sense to get the answer.
12% of 130 is 15.6 hope it helps!
The answer is: B. x=+_14; c=6
Hope this helps, happy holidays!! :p