q3 options for the first dropdown: global maximum / local maximum / break-even point / equilibrium point / point of diminishing returns / vertex

q3 options for the second dropdown: a partition point / a critical point / a break-even point / an inflection point / an equilibrium point

Question 3 1 pts If sales N(@) are expressed as a function of the amount z spent on advertising, then the dollar amount at which N'(@), the rate of change of sales, goes from increasing to decreasing is call the [ Select ] If d is that dollar amount, then (d, N(d) ) is [ Select ] of N(a). Question 4 1 pts Suppose f"(x) > 0 on some interval (a, b). Check all of the following statements that must be true. O f is decreasing on the interval (a, b). Of is concave upward on the interval (a, b). O f is increasing on the interval (a, b). Of' is increasing on the interval (a, b). O f is concave downward on the interval (a, b). O f' is decreasing on the interval (a, b)