1. (a) D: {-2, 0, 1, 3, 5}; R: {1, 2, 4, 5}(b) Function(c) A-1 = {(4, 3), (2, 5), (1, 0), (4, 1), (5, −2)}(d) Not a function

2. (a)D: {-1, 3, 5}; R: {1, 2, 3, 5}(b) Not a function(c) B-1 = {(2, 5), (3, −1), (5, 3), (1, 5)}(d) Function

3. 20

4. 1

5. 3.5

6. 8/7

7. 20

8. −14

9. 1

10. −12

11. 17

12. 31

13. 7

14. 5.5

15.

16. x + 3

17.

18.

19. k-1(x) = 2(x − 3)

20. x ≠ 1/2