those are the questions

1) Construct a truth table for the following: a) f(x,y)=xy+xy b) f(x,y,z)=xyz+xyz+xyz+xyz+xyz 2) Simplify the following functional expressions using Boolean algebra and its identities a) xy+xy+xz b) xyz+xyz c) x(y+z)(x+z) d) xyz+x(y+z) e) x(x+y) 3) The logic circuit shown in the diagram directly implements which of the Boolean expressions? 4) The logic circuit shown in the diagram directly implements which of the Boolean expressions