(Need some Help with these two proofs in discrete math/ structures)

Proof by Contradiction

A) Let x be any positive real number. Use a proof by contradiction to show that if x is

irrational then x^1/6 is also irrational. (Proof must be by contradiction)

A) Use a disproof by counter-example to prove that converse of A. Is not true:

False Claim: If x^1/16 is irrational then x is also irrational