1. Degree: 7. Leading coefficient: \( 4 \)
2. Degree: 6. Leading coefficient: \( 5 \)
3. Degree: 2. Leading coefficient: \( -1 \)
4. Degree: 3. Leading coefficient: \( -4 \)
5. Degree: 4. Leading coefficient: \( -2 \)
6. Degree: 5. Leading coefficient: \( 6 \)
7. Vertical: 12. Horizontal: \( \{ -2, 1, 3 \} \)
8. Vertical: \( -60. \) Horizontal: \( \{ -5, -1, 4 \} \)
9. Vertical: 2. Horizontal: \( \{ -\tfrac{1}{2}, \tfrac{1}{3} \} \)
10. Vertical: \( -36. \) Horizontal: \( \{ -\tfrac{3}{4}, 4 \} \)
11. Vertical: 0. Horizontal: \( \{ 0, 1, 3 \} \)
12. Vertical: 0. Horizontal: \( \{ -5, 0, 2 \} \)
13. \( \{ -1.64575, 3.64575, 5 \} \)
14. \( \{ -1.8284, 3.8284, 4 \} \)
15. \( (3, \infty) \)
16. \( (5, \infty) \)
17. \( (-\infty, -2) \cup (1,3) \)
18. \( (-\infty, -6) \cup (-3,4) \)