Final answer:
The resistance of the piece of conductor is 180 Ω.
Step-by-step explanation:
The resistance of a piece of metallic conductor can be calculated using the formula:
R = (ρ * L) / A
Where R is the resistance, ρ is the resistivity, L is the length of the conductor, and A is the cross-sectional area of the conductor.
Using the values given, we can plug them into the formula:
R = (18 x 10^-6 Ω*m * 30 m) / (3.0 x 10^-6 m^2)
Simplifying the expression, we find that the resistance of the piece of conductor is 180 Ω.