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21-32 Find the derivative of the function using the definition of derivative. State the domain of the function and the domain of its derivative. 21. f(x) = 3x - 8 22. f(x) = mx + b 23. f(t) = 2.512 + 6t 24. f (x) = 4+ 8x - 5x2 25. A(p) = 4p' + 3p 26. F(t) = 13 - 5t + 1 v 27. f(x) = x 2 - 4 28. F(v) = - v + 2 u + 1 29. g(u) = 30. f(x) = x4 4u - 1 31. f(x) = - 32. g(x) =