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. When will...

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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. When will worldwide mobile ad spending reach $41 billion?

Answered Same DayDec 20, 2021

Answer To: The amount spent worldwide in advertising on mobile devices can be estimated by f(x) = 0.4x2 + 0.01x...

David answered on Dec 20 2021

124 Votes

f(x) = 0.4x2 + 0.01x+ 0.9 where
x = number of yrs after 2005
f(x) = amount in billion dollars
Given:
f(x) = 41
Putting into equation:
41 = 0.4x2 + 0.01x+ 0.9
0.4x2 + 0.01x− 40.1 = 0
Solving the quadratic equation by comparing to ax2 + bx+ c = 0 :
a = 0.4, b = 0.01, c = -40.1
The roots are...

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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. When will...

Answer To: The amount spent worldwide in advertising on mobile devices can be estimated by f(x) = 0.4x2 + 0.01x...

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