It is fractions on a number line right?
There are 50% chance's that it would land on heads or tails. there could be many different outcomes like (H) for heads and (T) for tails many times like this H, T, H, T, H, T.
1. substracting problems
2. problems
Answer: 
Explanation:
Highlight the first digit on the very left (2). The 7 right next to it means we'll round that 2 up to a 3. Every other digit becomes a zero.
The number 27,895,168,401,112 rounds to 30,000,000,000,000 which is the number 30 trillion.
It converts to the scientific notation
because we basically start with 3.0 and move the decimal point 13 spots to the right to arrive at 30 trillion as shown above.
The answer is n-9=27, I am 100% confident in my answer...hope you get a nice grade :)