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4 years ago

6

The population of a certain town doubles every 24 years. If the population of the town was 8,000 in the year 2000, in what year

will the population be 128,000?

1 answer:

andrew11 [14]4 years ago

7 0

Well, if it doubles every 24 years, 128 = 2^7, and 8 = 2^3. Since 7 - 3 = 4, you can do $24 \cdot 4$ which equals 96

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Alexandra [31]

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<h2>Explanation:</h2>

The explicit formula for the general nth term of the arithmetic sequence is given by:

$a_{n}=a_{1}+d(n-1) \\ \\ \\ Where: \\ \\ a_{n}:nth \ term \\ \\ n:Number \ of \ terms \\ \\ a_{1}:First \ term \\ \\ d:common \ difference$

Here we know that:

$a_{1}=-3 \\ \\ a_{10}=69$

So, our goal is to find the common difference substituting into the formula:

$a_{10}=a_{1}+d(10-1) \\ \\ 69=-3+d(9) \\ \\ Solving \ for \ d: \\ \\ 9d=69+3 \\ \\ 9d=72 \\ \\ d=8$

Finally, we can write the explicit formula as:

$\boxed{a_{n}=-3+8(n-1)}$

<h2>Learn more:</h2>

Geometric series: brainly.com/question/1509142

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