Given D={2,5,8,9} and P(x,y,z)="x+y+z>20" a) Evaluate x,y,zP(x,y,z), determining if it is true or false. Thoroughly justify your answer including showing true/false values of the predicate statement. b) Evaluate x,y,zP(x,y,z), determining if it is true or false. Thoroughly justify your answer including showing true/false values of the predicate statement