Given l= 30in., w= 20in., h= 18in., and x= 36.1in., find the length of d. Round the answer to the nearest tenth

To find the length of d, we first need to calculate the diagonal of the rectangular prism using the Pythagorean theorem.

d = sqrt(l^2 + w^2 + h^2)
d = sqrt(30^2 + 20^2 + 18^2)
d = sqrt(900 + 400 + 324)
d = sqrt(1624)
d ≈ 40.3 inches

Therefore, the length of d is approximately 40.3 inches when rounded to the nearest tenth.