If " x y" is false, then which of the following is correct? a) yis true. b) y is false. c) y could be true or false. question 20 (1 point) if "x = y" is false, then which of the following is correct? a) y is true. b) yis false. c) y could be true or false. question 21 (1 point) for the following, let pbe true, q be false, rbe true, and sbe false. determine the truth value of the compound proposition. pv (sr) a) the disjunction is true. b) the disjunction is false. question 22 (1 point) for the following, let pbe true, q be true, rbe false, and sbe unassigned. determine the truth value of the compound propositions. if the truth value cannot be determined, then make that your choice. [pv (svr)] = 0 a) the truth value of the compound proposition is true. b) the truth value of the compound proposition is false. c) the truth value of the compound proposition cannot be determined.