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To find the length of "d," we can use the formula for the length of a diagonal in a rectangular prism. The formula is:
d = √(w^2 + h^2 + I^2)
Substituting the given values:
d = √(20^2 + 18^2 + 30^2)
≈ √(400 + 324 + 900)
≈ √(1624)
≈ 40.3
Therefore, the length of "d" is approximately 40.3 inches. Rounded to the nearest tenth, it would be 40.3 inches.