I think it is -14. I inserted 4 as n. I don't know if that's how you do it.
The answer is B. 245.04/3.14 = 78pi
Hope this helps
2500x0.80=2000 so i think it would be 2000 in 8 years
or if youre adding the 2000 to the already existing 2500 then it would be 4500.
12:7*2=24:14
The radio is of 12:7 is 14:14