Answer:
4877 fish
Step-by-step explanation:
Each year, the fish population is multiplied by 1-6% = 0.94, so after 8 years it has been multiplied by 0.94^8 ≈ 0.609569.
At that time, the population is ...
8000×0.609569 ≈ 4877 . . . fish
59.96.
If you distribute 4 to 14.99 then you get the answer above.
Answer:
The boat traveling at 24 kph when John goes downstream.
Step-by-step explanation:
We are given the following in the question:
John has a boat that will travel at the rate of 15 kph in still water.
Let x be the speed of the current.
Speed of boat in upstream
![(15-x)\text{ kph}](https://tex.z-dn.net/?f=%2815-x%29%5Ctext%7B%20kph%7D)
Speed of water in downstream
![(15+x)\text{ kph}](https://tex.z-dn.net/?f=%2815%2Bx%29%5Ctext%7B%20kph%7D)
Relation:
![\text{Speed} = \dfrac{\text{Distance}}{\text{Time}}](https://tex.z-dn.net/?f=%5Ctext%7BSpeed%7D%20%3D%20%5Cdfrac%7B%5Ctext%7BDistance%7D%7D%7B%5Ctext%7BTime%7D%7D)
We have to find the speed of boat in downstream.
Time to travel upstream for 35 km = Time to travel 140 km downstream
![\displaystyle\frac{35}{15-x}=\frac{140}{15+x}\\\\35(15+x) = 140(15-x)\\525 + 35x = 2100 - 140x\\175x = 1575\\x = 9](https://tex.z-dn.net/?f=%5Cdisplaystyle%5Cfrac%7B35%7D%7B15-x%7D%3D%5Cfrac%7B140%7D%7B15%2Bx%7D%5C%5C%5C%5C35%2815%2Bx%29%20%3D%20140%2815-x%29%5C%5C525%20%2B%2035x%20%3D%202100%20-%20140x%5C%5C175x%20%3D%201575%5C%5Cx%20%3D%209)
Thus, speed of current is 9 kph.
Speed of boat in downstream = 15 + 9 = 24 kph.
Thus, the boat traveling at 24 kph when John goes downstream.