This question refers to unions and intersections of relations. Since relations are subsets of Cartesian products, their unions and intersections can be calculated as for any subsets. Given two relations Rand S from a set A to a set B, RUS= {(x, y) E A × B| (x, y) ERor (x, y) E S} RN S= {(x, y) E A x B| (x, y) ER and (x, y) E S}. Let A = {-4, 4, 7, 9} and B = {4, 7}, and define relations R and S from A to B as follows. For every (x, y) EA x B, x R y |x| = [yl and xSy+x- y is even. Which ordered pairs are in A x B, R, S, RU S, and Rn S? (Use set-roster notation to enter your answers.) A xB = R = S = RUS = ROS =

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