need help with these

\fA company manufacturing cars at plant A in Detroit and plant B in St. Louis has found that its total cost function is C + 2y 2 + 2cy -+ 50r + 10y + 30 when a cars are produced at plant A and y at plant B. What production level at plant A should the company set to minimize the(ii) At what price should the company set the Agassi raquet to maximize revenue? 1. PA = $36 2. PA = $38 3. PA = $39 4. PA = $35 097costs of production when filling an order for 90 cars? 1. prod plant A = 70 cars 2. prod plant A = 60 cars 3. prod plant A = 40 cars 4. prod plant A = 50 cars 5. prod plant A = 80 cars\fFind the dimensions of the rectangular box with largest volume if the total surface area is given as 96 cm-. 1. 6 cm, 6 cm, 6 cm 2. 2 cm, 4 cm, 8 cm\f3. 2 cm, 2 cm, 11 cm 4. 1 cm, 1 cm, 23.5 cm 5. 4 cm, 4 cm, 4 cm