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January 27, 2015

January 27, 2015

Posted by **Stephanie** on Sunday, May 8, 2011 at 10:36am.

Calculate, to three significant figures, the number of mobile phone users after 19 years. You may find it useful to first devise a formula for the number of mobile phone users after n years.

- maths -
**Reiny**, Sunday, May 8, 2011 at 10:41amnumber of mobile phones

= 350(1.25)^19 = 24 286.13

I thought Phoneville was a small town?

- maths -
**Stephanie**, Sunday, May 8, 2011 at 10:51amThanks! I've no idea, i thought my answr was too far off but I was using the wrong formula. Thanks!

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