Yes. What is inside parentheses. 9 + 3 = 12. Then move on.
Then you simplify your denominator.
The denominator is already simplified. It is "2."
No. It's 2*12. Unless you want to add in a set of parentheses to isolate the term.
48
_____
2*12
Both the 2 and the 12 are being divided into 48.