Answer:
2
i think
Step-by-step explanation:
Answer:

Step-by-step explanation:

Combine all like terms.


Multiply both sides by -1.

Answer: 1029
Step-by-step explanation:
Answer:
The range of this set of numbers is 9
Step-by-step explanation:
The range is the greatest number subtracted by the lowest number
in this problem that is 21-12