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Posted by **Miguel** on Thursday, March 24, 2011 at 11:29am.

- Math Help -
**Reiny**, Thursday, March 24, 2011 at 11:51amsolve 41 = .4x^2 + .01x + .9

multiply by 100

40x^2 + x + 90 = 4100

40x^2 + x - 4010 = 0

x = (-1 ± √641601)/80 = 10 or a negative

it will take 10 yrs

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