1. $x=-3$

2. $x=32$

3. $\text{Range }=(-\infty ,1);\text{ horizontal asymptote}:y=1$

4. $-3$

5. $x=3$

6. $-3$

7. $\text{ln }3x^5$

8. ${\displaystyle \frac{\text{ ln }\left({\displaystyle \frac{5}{2}}\right)}{\text{ ln }2}}$

9. ln 2

10. $\text{ln }2+3\text{ ln }x-5\text{ ln }(x+1)$

11. $-5$

12. $y=\text{ln }(x-1)+3$

13.

14. $(-\infty ,0)$

15. $\text{ln }{\displaystyle \frac{x^3(x^3+2)}{\sqrt{3x^2+2}}}$

16. $x=3$

17. $x=3$

18. $A(t)=15\text{,}000{(1.0175)}^{4t}$

19. In 1983 (after 23.03 yr)

20. The Nicaragua earthquake was about 2.5 times the intensity of the Morocco earthquake.