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Derivatives - A High School Principal

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A high school principal is concerned about the drop in the percentage of students who graduate from her school, show in the following table.

Years entered school (t) 1989 1992 1995 1998 2001
Percent graduating (P) 62.4 54.1 48.0 43.5 41.8

a) Estimate dP/dt for each of the three-year intervals between 1989 and ...

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