Answer:
See explanation
Step-by-step explanation:
4.
(a) {A, E, I}
(b) {Red, Orange, Yellow,...}(You know the rest, Right?)
(c) {9, 18, 27, 36, 45}
(d) (write down the colors in your school flag. Literally)
(e) {12, 14, 16, 18, 20, 22}
5.
(a) Well-defined. You can count the pupils, right?
(b) Not well-defined. You can't define shy.
(c) Not. You can't define well-liked.
(d) Not. same as c
(e) Well-defined. You can define your textbook.
(f) Not. You can't define attractive.
