Finding Max and Min "Application of Derivatives" Hello There! The following question I need help in and it would be appreciated. Thank you very much! Manufacturing Tires Your company can manufacture x hundred grade A tires and y hundred grade B tires a day where 0 (greater than or equal to) x (less than or equal to) 4 and y = (40-10x)/(5-x) Your profit on a grade A tire is twice your profit on a grade B tire. What is the most profitable number of each kind to make? Thank for your time!