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Mathematics 20 Online
OpenStudy (anonymous):

How long would it take to turn $500 into $800 at an interest rate of 4.2%

undeadknight26 (undeadknight26):

I like exponential functions :D hint.

undeadknight26 (undeadknight26):

no? ok... f(x) = 500(4.2)^x

undeadknight26 (undeadknight26):

plug in and see :D

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