Here are the answers for each question in the image:

61. Option (3)
62. Option (4)
63. Option (2)
64. Option (2)
65. Option (4)
66. Option (3)
67. Option (2)
68. Option (3)
69. Option (2)
70. Option (1)
71. Option (4)

Let me know if you need any explanations or further assistance.

Related Questions:

1. How is the differential equation approach applied to find specific values for growth problems?
2. Can you elaborate on solving for population dynamics using differential equations?
3. How does substitution affect the mean in statistical questions?
4. What is the importance of variance and standard deviation in data analysis?
5. How do coefficients of variation relate to standard deviation?

Tip: When solving differential equations, always verify solutions by differentiating the result to check if it satisfies the original equation.