Answer: Square root 400 = 20, 20 is a rational number.
Square root 1000 = 31.6227766 which is irrational
³√30 = 3.107232506 which is irrational
My sincerest apology that's all I know at the moment.
Step-by-step explanation: Tbh I looked most of them up in terms of finding out if they were Rational or Irrational but basically you find the square root of the problems that have the root sign and then find if their rational of not