Answer:
Step-by-step explanation:
They are closed under addition, subtraction and multiplication.
Answer:
yes you may use the answer will be 100% correct
Answer:
x=4
Step-by-step explanation:
I cant see all of 11 and 14
12:

13:

15:

16:
Answer: v= 32-f
Step-by-step explanation: hope this helps! Have a good day!