1) 15/15 which is 1
2)100/30 which is 3 1/3
3)8.2
4) too long sorry
Answer:

Step-by-step explanation:
The fish population after t years can be modeled by the following equation:

In which F(0) is the initial population and r is the constant rate of decay.
Year one the fish population was 18000
This means that 
In year three the fish population was 8000 fish.
Two years later, so 






So

Answer:

Step-by-step explanation:



Reducing 3 from numerator and denominator,
