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19 February, 17:39

a cereal box has a length of 8 inches, a width of 1 3/4 inches, and a height of 12 1/8. What is the surface area of the box?

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  1. 19 February, 18:31
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    270 7/16 in^2.

    Step-by-step explanation:

    The surface area equals the sum of the areas of 3 pairs of congruent rectangles.

    These are 2 * 8 * 1 3/4 + 2 * 8 * 12 1/2 + 2 * 1 3/4 * 12 / 1/8

    = 16 * 7/4 + 16 * 25/2 + 2 * 7/4 * 97/8

    = 28 + 200 + 42 7/16

    = 270 7/16 in^2.
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