To determine the population growth of the herd of water buffalo given the birth rate, death rate, immigration, and emigration figures, follow these steps:
1. Calculate the population increase:
- Start with the birth rate: 35 water buffalo are born.
- Add the immigration: 4 new water buffalo come into the population.
- Therefore, the population increase is calculated as:
[tex]\[ \text{Population Increase} = 35 + 4 = 39 \][/tex]
2. Calculate the population decrease:
- Consider the death rate: 7 water buffalo die.
- Add the emigration: 17 water buffalo leave the population.
- Therefore, the population decrease is calculated as:
[tex]\[ \text{Population Decrease} = 7 + 17 = 24 \][/tex]
3. Calculate the net population growth:
- Subtract the total population decrease from the total population increase:
[tex]\[ \text{Population Growth} = \text{Population Increase} - \text{Population Decrease} = 39 - 24 = 15 \][/tex]
Therefore:
- The population increases by 39.
- The population decreases by 24.
- The net population increase (or growth) is 15 water buffalo.
The correct options from your list would be:
- population increases by 39
- population decreases by 24
- population increases by 15 (net growth)
Therefore, the population growth being referred to should be:
[tex]\[ \text{population increases by 15} \][/tex]
So, the net population growth of the water buffalo herd is 15.
