Homework problems: Nested quantifiers (1.9-1.10) 1) Determine the the domain is the set of all real numbers. of each expression below if a) 3xVy (xy = 0) example.) (If true, give an b) VxVy3x (z = (x-y)/3) counterexample.) (If false, givea (If false, give a counterexample.) d) 3xZy3x (x2 +y2-z2) an example.) (If true, give