E Homework: HW 3.2 Optimization: General Question 15, Instructor-created question HW Score: 66.67%, 10 of 15 points Applications O Points: 0 of 1 Save You want to build a 1000 square foot rectangular infinity pool. Three of the sides will have regular pool walls, and the fourth side will have the infinity pool wall. Regular pool walls cost $12 per foot (regardless of how deep the pool is), and the infinity pool wall costs $40 per foot (regardless of depth). How long should you make the infinity wall so that you minimize your costs? It should be feet (Round answer to nearest tenth.)