The total spent on research and development by the federal government in the United States during 2002–2012 can be approximated by S(t) = 3.1 ln t + 22 billion dollars (2 ≤ t ≤ 12), where t is the year since 2000.† What was the total spent in 2006 (t = 6)? (Round your answer to the nearest whole number.) $ billion

28 billion dollars

Step-by-step explanation:

The total spent on research and development by the federal government in the United States during 2002–2012 can be approximated by

 billion dollars (2 ≤ t ≤ 12), where t is the year since 2000.

If t=6, that is, In the year 2006,

=28 billion dollars (To the nearest billion dollars)

In 2006, the federal government of the United States spent approximately $28 billion on research and development.

the correct answers i think are b. and d.

give me brainliest if it is correct!