Please provide explanations for 21, 23, 29, 31

Absolute Extrema on Finite Closed Intervals In Exercises 21-36, find the absolute maximum and minimum values of each function on the given interval. Then graph the function. Iden- tify the points on the graph where the absolute extrema occur, and include their coordinates. 21. f(x) = =x - 5, -25x=3 22. f(x) = -x - 4, -4 5xs 1 23. f(x) = x2 - 1, -15x= 2 24. f(x) = 4 - >, -25x=1 25. F(x) = -- 0.5 S x = 2 26. F(x) = -4 7, -25x5-1 27. h(x) = Vx, -1=x=8 28. h(x) = -3x2/3, -1 = x= 1 29. g(x) = V4 - x2, -25x=1 30. g(x) = - V5 - 32, - V5 s x= 0 31. f(0) = sin 0, 5 TT 2 6 32. f(0) - tan 0, 33. g(x) - csc x, 34. g(x) = sec x, 35. f(1) - 2 - t