Resistance of Wire....HeLp!! 1. The problem statement, all variables and given/known data A 122-cm-long wire is made by welding a 0.36-mm-diameter, 21-cm-long copper wire to a 0.47-mm-diameter, 101-cm-long iron wire. What is the resistance of the composite wire? 2. Relevant equations 3. The attempt at a solution How do I do this since it is made up of 2 different materials????