Problem

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

Facebook Users The number of active Facebook users increased from 100 million in 2008 to 1 billion in 2012. (Source: Business Insider.)

(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 550 million or more.

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Solutions For Problems in Chapter 2.3

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