1.4 Polynomial Functions Name and Rates of Change 1. The Practice Set 2 Date Period for x Problems 19 -20, Determine the global minimum and global maximum for the following polynomial who graphs. If the graph does not have a specific global extrema, write "none" in the appropriate space. 19. Global minimum is atx = 20. Global minimum is atx = Global maximum is at x =_ Global maximum is at x = Problems 21-23, For each polynomial function, determine if the graph of the function must have a global minimum, global maximum, or neither. Explain your reasoning. 21. f(x) =x4+5x3-x+2 22. g(x) =-x6+2x3+x2-3 23. h(x) = 2x3 + x2 + 3x