The number of active Facebook users increased from 100 million in 2008 to 1 billion in 2015.

Question:

The number of active Facebook users increased from 100 million in 2008 to 1 billion in 2015. 

(a) Find a formula for a linear function U that models this growth in millions of users, where x is years after 2008. 

(b) Estimate when the number of users was 485 million or more.

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