The answer is...
1. Is A
2.Is B
Hope This helps!!
Answer: 
Step-by-step explanation:
The expression can be simplified by applying the a properties of exponents, specifically the Product of powers, which states that:

Where b is the base and a and c are exponents.
Then simplify it by rewriting the base (
) and adding the exponents of the expression (8 and 9).
You will get the expression simplified and written as a power:

Answer:
x = 48°
Step-by-step explanation:
x + x + 84° = 180°
2x = 180° - 84°
2x = 96°
x = 96°/2
x = 48°
0+9=9
1*9=9
0 plus any number equals that number. 1 multiplied by any number equals that number
All of them
But if u had to pick one I would say addition or subtraction