To find the perimeter of the object, we need to add up the lengths of all its sides.
If we assume that the object is a rectangular prism, then it has 12 edges, each with a length of either x, y, or z. So the perimeter would be:
P = 4x + 4y + 4z
Substituting in the values of x, y, and z that you provided, we get:
P = 4(9) + 4(21) + 4(29)
P = 36 + 84 + 116
P = 236 inches
Therefore, the perimeter of the rectangular prism with dimensions x=9, y=21, and z=29 inches is 236 inches.