Answer:
The left side of the equation will result in a rational number, which could be a non-perfect square.
Explanation:
According to the Pythagorean theorem, the sum of the squares of the legs of a right triangle is equal to the square of the hypotenuse.
Take 

As
,
Here, 29 is not a perfect square.
So, c is irrational.
If a is a rational number and b is a rational number, c could be an irrational number as the left side of the equation will result in a rational number, which could be a non-perfect square.
Answer:
A. the Musica religion becomes popular in South America. I'm sorry if I'm wrong.
Answer: False consensus effect.
Explanation:
The false consensus effect is a believe that an individual holds that his/her: opinions, ideas, belief, religion is the widely accepted one, when that is not the case.
Individuals that have the ideology of consensus effect always believe that they are correct.
Answer:
The city-state of Sparta did not join the Delian League.
Explanation:
Sparta chose to not join the Delian league because it was led by Athens, which is traditionally one of their rivals.