Find the percentage rate of change of f(x) at the indicated value of x. f(x)=122+36x; x=6 E The percentage rate of change of f(x) at x = 6 is |:|%. (Type an integer or decimal rounded to the nearest tenth as needed.) Use the price-demand equation below to find E(p), the elasticity of demand. x = f(p) = 35,000 - 550p Use the price-demand equation below to find E(p), the elasticity of demand. x = f(p) = 4800 4p2 Use the price-demand equation to find E(p), the elasticity of demand. x = f(p) = 200 95 In (p)