please solve:                                                                                                                                                                 4. Given the first derivative of a Conference function is h' (t) = −8t + t2 − 9, where t represents time in hours. Determine the time(s) for which the conference will be most exciting (maximized). Give reason(s)/ for selecting that time(s).  5. Calculate and describe the point of inflection for the following function: f(m) = m3 − 3m2 − 9m + 7

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