there are 4 possible scoring plays in an NFL football game

(T) touch down -6 points
(A) point after touchdown can only be earn with a touch down) - 1 point
(F) field goal - 3 points
(S) safety - 2 points

1. how many different ways could the team score 11 points?
I think it is 4? not sure..
TASS, TFS, FFFS, SSSSF,

2. what final scores between 0 and 30 are NOT possible for a team to make?

1 (i think this is the only one is impossible, but no clue..

please, somebody have a look at it..