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The population of the bacteria culture doubles every 2

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The population of the bacteria culture doubles every 2 [#permalink] New post 13 Mar 2008, 20:39
The population of the bacteria culture doubles every 2 minutes. Appox how many minutes will it take for the population to grow from 1000 to 500,000 bacteria ?

10
12
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18

formula = 1000 * 2 ^ x = 500000
where x = total number of minutes.

2 ^x = 500

I need some assistance here. Thanks
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Re: Population [#permalink] New post 13 Mar 2008, 22:42
Is not quite that.
min 0 - 1,000
min 2 - 2,000=1,000*2^1
min 4 - 4000=1000*2^2;
min 6 - 8000=1000*2^3

Be careful! It doubles every 2 minutes.

So, 1,000*2^x=500,000
2^x=500. It asks you to approx. You know that 2^9=512, so x=9.
Because the pop doubles every 2 minutes, the result=9*2=18 minutes.
OA?
Re: Population   [#permalink] 13 Mar 2008, 22:42
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