Question

К концу 2009 года в городе проживало 53100 человек. Каждый год число жителей города возрастало на одну и ту же величину. В конце 2018 года в городе проживало 60390 человек. Какова была численность населения этого города к концу 2015 года? Vielen Dank im Voraus!

Answer 1

Решение:

60390-53100=7290

7290÷9=810

810×6=4860

53100+4860=57960

Ответ:

В конце 2015 года было 57970

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Answer 2

Population Growth Calculation

To calculate the population at the end of 2015, we can use the given information about the population growth rate and the population at the end of 2009 and 2018.

Given: - Population at the end of 2009 = 53,100 - Population at the end of 2018 = 60,390 - Constant annual population growth rate

Calculation

Let's denote the constant annual population growth rate as r.

Using the formula for exponential growth: \[ P_{2018} = P_{2009} \times (1 + r)^9 \]

Where: - \( P_{2018} \) = Population at the end of 2018 - \( P_{2009} \) = Population at the end of 2009 - 9 = Number of years from 2009 to 2018

We can solve for r using the given population values.

\[ 60,390 = 53,100 \times (1 + r)^9 \]

Solving for r will allow us to calculate the population at the end of 2015.

Solution

The population at the end of 2015 can be calculated using the formula: \[ P_{2015} = P_{2009} \times (1 + r)^6 \]

Where: - \( P_{2015} \) = Population at the end of 2015 - \( P_{2009} \) = Population at the end of 2009 - 6 = Number of years from 2009 to 2015

Let's calculate the population at the end of 2015 using the given information.