You want to build a 1200 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 $25 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.)

Q: ecimal:

A: From triangle BDC , BD=18mm,∠DAB=45°,∠DCB=αBA=dAC=b

Q: Need a little help

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A: Let's solve.

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