Silcates are minerals with silicon bonded with oxygen.
I don't think any answer would be correct, if you have an option "none of the above" then that would be the correct answer
Answer:
14
Explanation: The reason why is because adding a negative is pretty much subtracting by 2. 9-2=7. Then multiply 7 by 2 like add 7 to 7 and you get 14.