7. Let Q(x,y,z) be the statement " x+y=z." What are the truth values of the statements xyzQ(x,y,z) and zxyQ(x,y,z), where the domain of all variables consists of all real numbers? 8. Translate these statements into English, where the domain for each variable consists of all real numbers. a) xy(xy=y) b) xy(((x0)(y0)) c) xyz(x=y+z)