algebra
posted by pat solon .
The amount spent worldwide in advertising on mobile devices can be estimated by f(x) = 0.4x2 + 0.01x + 0.9, where x is the number of years after 2005 and f(x) is in billions of dollars.
b)When will worldwide mobile ad spending reach $41 billion?

algebra 
Henry
F(x) = Y = 0.4x^2 + 0.01x + 0.9 = 41 B.
Y = 0.4x^2 + 0.01x + 0.9 41 = 0,
Y = 0.4x^2 + 0.01x  40.1 = 0,
Use Quadratic Formula to find.
X = 10 Years after 2005 = 2015.
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