[Solved] (bonus) The U.S. production of phosphate rock (in thousands of metric tons) is given approximated by f (t) = -890 t 2 + 3100 t + 43000 where
Question: (bonus) The U.S. production of phosphate rock (in thousands of metric tons) is given approximated by
f ( t ) = –890 t 2 + 3100 t + 43000
where t is time in years and t = 0 corresponds to 1995.
- Find the average rate of change of production between 1997 and 2000.
- Find the instantaneous rate of change of production in 1999.
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