No they are not. The numbers Pi and e are irrational and are not radicals. There are many others.
Sometimes. The square root of 2 is, but the square root of 9 is not.
No. 4/9 is not a perfect square but radical(4/9) = 2/3 is rational.
If you are taking the square root of a non-square number (not 1, 4, 9, 16, 25, 36 etc.), then you have an irrational number. Radicals are not rationals.
electronegative radicals are anions or acid radicals.
similar radicals are radicals with desame index and radicand ex: the square root of 5 squared
"You get what you give" by the New Radicals
Multiply by the conjugate.
Radicals of the Left was created in 2004.
Radicals of the Left ended in 2010.
New Radicals ended in 1999.
New Radicals was created in 1997.