For the years from 2006 and projected to 2021, the national health care expenditures H, in billions

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For the years from 2006 and projected to 2021, the national health care expenditures H, in billions of dollars, can be modeled by
H = 2009e0.05194t
where t is the number of years past 2005. When are national health care expenditures expected to reach $4.0 trillion (that is, $4000 billion)?
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