Please solve and show work. Thank you

157 76. Free Response The function f is defined as f(x) = (4 In x)/x3 for all x > 0. (a) Find f'(x). (b) Find an equation of the tangent line to the graph of f at x = e. (c) Find the critical number(s) of f. Does the function have a relative maximum, a relative minimum, or neither at each critical number? (d) Find lim f(x)