2. (a) (5 points) Show that p = q and -pv q are logically equivalent using any method. Explain. (b) (5 points) Determine if -(p q)= (pvq) is a tautology using any method. Explain.T 3. (a) (5 points) Suppose x is a positive integer. If x is odd, prove that x + 4 must also be odd. (b) (5 points) Is the converse true? If x + 4 is odd, is x also odd? Prove the statement or provide a counterexample