Question

In a word tile game, you score one positive point for each letter tile
that you use and one negative point for each tile that you have left.
10. During one round, Shelley used 14 tiles and could
not use 6. What was her score for that round?
11. Pete used 4 tiles, but he could not use 8. What
was his score that round?
12. Reasoning In the game, if you have 18 tiles and you cannot
use 3 of them, what will your score be for that round? Explain
how you found the answer.