The number of active Facebook users hit 2.414 billion at the end of June 2019 and 2.498 billion at the end of December 2019. With in months since the start of 2019, let f(r) be the number of active users in billions. Estimate /(12) and /' (12) and the relative rate of change of fat 12. Interpret your answers in terms of Facebook users. Estimate (12) exactly and round f' (12) and the relative rate of change to three decimal places. (12)= S' (12)= Relative rate of change The number of active Facebook users at the end of December 2019 was billion. The number was billion users per month, which represents a relative V rate of at % per month.