DISCRETE STRUCTURES. PLEASE Explain your process and why you did what you did. I'm currently struggling with how to set up proofs and needed terminology.

For each statement in 20-32, determine whether the statement is true or false. Prove the statement directly from the definitions if it is true, and give a counterexample if it is false. 28. For all integers a,b, and c, if abc then ab or ac. 29. For all integers a and b, if ab then a2b2