Final answer:
It would take approximately 100 years for the population to increase from 4 billion to more than 1 billion, and about 127 years to reach 8 billion.
Step-by-step explanation:
To determine how long it takes for the population to increase from 4 billion to more than 1 billion, we can use the information given in the table:
- 1 billion: 1800
- 2 billion: 1930
- 3 billion: 1960
- 4 billion: 1975
- 5 billion: 1987
- 6 billion: 1999
- 7 billion: 2012
- 8 billion: 2028
- 9 billion: 2054
From this, we can see that it took 75 years for the population to increase from 4 billion to 5 billion, and another 25 years to reach 6 billion. We can apply the same logic to determine how long it would take to reach 8 billion. So, it would take approximately 100 years for the population to increase from 4 billion to more than 1 billion, and about 127 years to reach 8 billion. In terms of years, it would take approximately 100 years and 127 years, respectively.