A rectangular box which is 4 in. by 7 in. by 7 in. is covered by foil. How much foil is required?

Foil must cover all six faces, so find the box’s surface area: 2(4 × 7) + 2(4 × 7) + 2(7 × 7) = 56 + 56 + 98 = 210 square inches. The correct choice is 210 sq. in.

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