A retail business owner determines that the number of items sold by her staff can be modeled by the equation f(s) = 350 + 213 In(s) where s is the number of staff members. Determine f'(s) = f'(12) = Which of the following is the best interpretation of f(12) = 879? Select an answer Which of the following is the best interpretation of f'(14) = 15? Select an