concerning mathematics: for a game i need the answer to the following
sequences. in each row are 3 sequences where the x indicates the
number to be changed. i tried it several times, and came up with valid
answers just not the ones they are looking for. the first person who
solves it correctly (so i come
1 round further in the game) gets 2.00 usd. i need the correct number
for each row (replacing the x).

1. 1 3 7, 4 5 12, 1 1 x   
2. 3 1 4, 8 5 9, 5 4 x    
3. 6 9 7. 4 7 5, 1 4 x   
4. 2 7 6, 9 5 1, 4 3 x

The first 3 answers could be:
1. x=5
2. x=5
3. x=2

I hope that helps.

Rainbow

the correct answer is actually 5128. my mistake was that i missed the
second sequence. 1+2=3  5+3=8  1+4=5   therefore 1 is the correct
answer.