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To find the length of d, we can use the Pythagorean theorem:
d^2 = h^2 + x^2
Plugging in the values:
d^2 = 18^2 + 36.1^2
d^2 = 324 + 1301.21
d^2 = 1625.21
d ≈ √1625.21
d ≈ 40.3 inches
Therefore, the length of d is approximately 40.3 inches.