wikiHow Domain and Range Answers 1. Domain: all real numbers; Range: all real numbers. 2. Domain: (-∞, 4]; Range: [0, ∞). 3. Domain: (-∞, 1) ∪ (1, 3); Range: (-∞, ∞). 4. Domain: all real numbers; Range: [1/4, ∞). 5. Domain: (-∞, 2) ∪ (2, ∞); Range: (-∞, 0) ∪ (0, ∞). 6. Domain: all real numbers; Range: (-∞, ∞). 7. Domain: all real numbers; Range: [0, ∞). 8. Domain: all real numbers; Range: (0, ∞). 9. Domain: all real numbers; Range: [-1, 1]. 10. Domain: (0, ∞); Range: (-∞, ∞). 11. Domain: (-∞, 0) ∪ (0, ∞); Range: (-∞, 0) ∪ (0, ∞). 12. Domain: (-∞, -2) ∪ (-2, 2) ∪ (2, ∞); Range: (-∞, 0) ∪ (0, ∞). 13. Domain: (-∞, 0) ∪ (0, ∞); Range: (0, ∞). 14. Domain: all real numbers; Range: [-1, 1]. 15. Domain: (-∞, 1) ∪ (1, ∞); Range: (-∞, -5/2) ∪ (-5/2, ∞). 16. Domain: (-∞, 1) ∪ (1, ∞); Range: (-∞, ∞). 17. Domain: (kπ - π/2, kπ + π/2), where k is an integer; Range: (-∞, ∞). 18. Domain: (-∞, -1) ∪ (-1, 1) ∪ (1, ∞); Range: (-∞, 0) ∪ (0, ∞). 19. Domain: all real numbers; Range: [-3, 1]. 20. Domain: (-∞, -1) ∪ (-1, ∞); Range: (-∞, ∞). Page