Answer:

when there is a radical in the denominator, we should rationalize (mutiply the denominator and numerator by the radical) to get rid of the radical in the denominator.
Answer:
matter can either be created nor destroyed but can be transmitted fromone state to another state
2,8,3 because Aluminium has the Atomic Number 13
Answer:
What group of people ay?
Maybe look at their differences in appearance: height, size, weight, skin color, clothing choice?