Unit 11 Answers
1. a) {-2, 2} b)
2. a) Yes b) No c) No
3. a) No b) Yes c) Yes d) No e) No f) No
4. Let x be an arbitrary element of A. We are going to show that x C. Since A B, this implies that x B. SinceB C, we see that x C. Since x A implies that x C, it follows that A C.
5.