A graph of a population of yeast cells in a new laboratory culture as a function of time is shown.
(a) Describe how the rate of population increase varies.
(b) When is this rate highest?
(c) On what intervals is the population function concave upward or downward?
(d) Estimate the coordinates of the inflection point.

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700 600 500 + Number of 400 + yeast cells 300 200 100+ 2 4 6 8 10 12 14 16 18 Time (in hours