How are 54, 56, 62, 64, and 70 computed

For the following exercises, use the definition of a derivative to find f' (x). 54. for) = 6 55. f(x) = 2 3x 56. f(x) = % + 1 57. for) = 4x2 58. for) = 5x x2 59. for) = V27: 60. f(x) = 'Vx 6 61. f(x) = g 62. f(x) =x+% 63. f(x) = % For the following exercises, use the graph of y = for) to sketch the graph of its derivative f ' (x). 64. 25 16 For the following exercises, the given limit represents the derivative of a function y = f(x) at x = a. Find f(x) and a. 68. lim (1 + h) 2/3 - 1 h - 0 h 69. lim 3 (2 + h) 2+2 - 14 h - 0 h 70. lim cos (7 + h) + 1 h -0 h