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Functions, derivatives, and critical numbers

Please show me how to reach correct solutions. Please see the attached file.
Thanks in advance,
Find f(x), given that...
Given that f is a differentiable function and the graph of its derivative is shown below, find the interval(s) in which f is decreasing.
Find the critical numbers...


Solution Summary

This shows how to find a function from the derivative and the graph of the derivative, as well as finding critical numbers and extrema.