ASAP, Please help with question #12, Thank You

12. 10 pts possible A company manufacturing cars at plant A in Detroit and plant B in St. Louis has found O 1. prod plant A = 6 that its total cost function is O 2. prod plant A = 8 C =x2 + 2y? + 2xy + 8x + 4y +2 3. prod plant A = 4 when r cars are produced at plant A and y at plant B. 4. prod plant A = 5 What production level at plant A should the company set to minimize the costs of pro- 5. prod plant A = 7 duction when filling an order for 8 cars