Answer: I think it is B
Step-by-step explanation:
After the first 18 years, the population of 1500 will be doubled to 3000.
After the next 18 years, making 36 years total, the population of 3000 will double to 6000.

Multiply 4 from both sides

Simplify
Answer:
D: 0.009
Step-by-step explanation:
Because 0.12 is 12 if you remove the zeros but D is correct because there are lots of place holders (0's) meaning its less then because it has more place holders compared to the others that don't have any place holders