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July 6, 2015

Homework Help: Math Help

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

Mobile ad spending. The amount spent worldwide in advertising on mobile devices can be estimated by f(x) =0.4x^2+0.01x+0.9. Where x is the number of years after 2005 and f(x) is in billions of dollars. When will worldwide mobile ad spending reaches $41 billion?

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