I said A the number of AP
As its one significant figure you are looking at the first number and the second number. If the second number is greater than 5 then you round the first number up and vice versa. In this case there is an eight, which is bigger than 5 obviously so you round the first number to get 40000.
C.)1h 5/6-1/3=5/6-2/6=3/6=1h
srry if you are confused im just in a rush.....Lol