Question 3 • Grade 7 Mathematics
The surface area of a rectangular prism is 2(lw + lh + wh). For A, the area is 2(3×5 + 3×7 + 5×7) = 142 square feet, which is less than 160. For D, it is 2(8×4 + 8×3 + 4×3) = 136 square feet, also less than 160. The other choices have surface areas of 162, 202, and 188 square feet, so they are too large.
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