Can I receive help with these questions?

5. Show that for an integer n, n is odd if and only if 3n + 2 is odd. (Hint: consider proving one direction by contraposition.) OPDue41 0 Pub J! 'NBUA ' 9 DA ley MOUS '9 7. Use a proof by contradiction to show that V3 is irrational. 8. Prove that n' +n is even for any integer n. (Hint: consider a proof by cases.)