Concept explainers
Scientific Research: 1983–2003 The percentage of research articles in the prominent journal Physical Review that were written by researchers in the United States during 1983–2003 can be modeled by
Where t is time in years since 1983. The graphs of
Determine, to the nearest whole number, the values of t for which the graph of P is concave up and where it is concave down, and locate any points of inflection. What does the point of inflection tell you about science articles? [HINT: See Example 4.]
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Applied Calculus
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