If f (x) = 2 + 3 and f (x) = 35, then what is x?

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to fill your box with one inch cubes first cover the bottom. this takes 48 rows of small cubes, each row containing 72 cubes. thus to cover the bottom takes 48 x 72 = 3456 cubes. since your box is 6" high you need 6 layers of 3456 cubes or 6 x 3456 = 20736 cubes to fill the box