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I've been set a GCSE investigation about find the volume of Trays. It's about the shop keeper who believes that when the are of the base is the same as the are of the four sides will mean that the volume will be at its maximum. So far I've done a table as shown below and also written an aim, hypothesis. I'm not sure what else to do. I know I have to find a general formula but I'm not sure. Here's the table as shown below. I have proven that the shop keeper is corrext but what else do I need to do.

Base Height Base Sides
16×16×1 = 256 16×16 = 256 16×1×4= 64
14×14×2 = 392 14×14 = 196 14×2×4= 112
12×12×3 = 432 12×12 = 144 12×3×4= 144
10×10×4 = 400 10×10 = 100 10×4×4= 160
8×8×5 = 320 8×8 = 64 8×5×4= 160
6×6×6 = 216 6×6 = 36 6×6×4= 144
4×4×7 = 112 4×4 = 16 4×7×4= 112
2×2×8 = 32 2×2 = 4 2×8×4= 64

Thanks for any help
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