You plan to build a fish tank with three different types of material. The bottom will be made of slate and cost $8 per square inch. The back wall will be opaque glass and will cost $5 per square inch. The front and two ends will be made of clear glass and will cost $0.70 per square inch. the ends of the tank will be square and the tank will hold 10,000 cubic inches of water. Write an equation for the total cost of the materials needed to build the tank in terms of the length L.

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