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The exponential model A = 608.4e^0.028 describes the population, A, of a country in millions, t years after 2003. Use the model to determine when the population of the country will be 700 million.

User IvanRublev
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1 Answer

7 votes

Answer:

the population is projected to reach 700 million around the year 2015.

Explanation:

To determine when the population of the country will be 700 million, you can set up the equation using the given exponential model:


A = 608.4e^(0.028t)

You want to find the time (t) when the population (A) is 700 million. So, you can rewrite the equation as:


700 = 608.4e^(0.028t)

Now, you need to solve for t. First, divide both sides by 608.4 to isolate the exponential term:


e^(0.028t) = 700 / 608.4

Now, take the natural logarithm (ln) of both sides to solve for t:


ln(e^(0.028t)) = ln(700 / 608.4)

The natural logarithm and exponential functions are inverse operations, so
ln(e^(0.028t)) simplifies to just 0.028t:


0.028t = ln(700 / 608.4)

Now, divide both sides by 0.028 to solve for t:


t = ln(700 / 608.4) / 0.028

Use a calculator to compute this value:

t ≈ 12.18 years

So, the population of the country is projected to reach 700 million approximately 12.18 years after 2003. To find the year, add 12.18 to 2003:

Year ≈ 2003 + 12.18 ≈ 2015.18

Rounded to the nearest year, the population is projected to reach 700 million around the year 2015.

User Mustafah
by
7.4k points
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