Yes, you can.
No, you can also use conjugates with more than one radical term. For example, if the denominator is root(2) + root(3), you can use the conjugate root(2) - root(3) to rationalize the denominator.
No, that is not what you do.
Yes, that is correct.
The 6th radical is raising something to the 1/6 power, and the 5th radical is the 1/5 power. Dividing means you subtract the exponents, and 1/6-1/5 is -1/30. The answer would be 1/(30th rad of the term).
It is called a variable fraction.
Radical salt is very probable an incorrect term.
Similar radicalssuch as ... 5(sq root 7) + 3(sq root 7) are similar because the radical has the same root index and the same number inside the radical. Like variables they can have different coefficients. 2x and 5x are similar ( called like terms) add the coefficients. 2x + 5x = 7x similarly 5(sq root 7) + 3(sq root 7) = 8(sq root 7)
It is a fraction in its reduced or simplest from.
Both!
The term 'radical' is oft seen in science and math.
The relative sizes of the numerator and denominator have nothing to do with the major axis.
The denominator