81 because each person has 9 people to greet and there’s 9 people so 9x9=81
Answer:
The value of a is 150 and b is 4822.
Explanation:
First, you have to expand to remove brackets :
Next, you have to simplify :
Next, you have to compare it :
E. Redundant. In my opinion most of the opinions are contradictory because invalid, falsified, and redundant have closely similar meanings
This is called in physics refraction phenomenon.
It occurs when light when the light passes from one medium with density d1 to another medium with density d2. The sight of the archer travel from air to deep into water & provokes a refraction.
