PHYSICS
posted by eissa .
1..........At what temperature of 0^C steel rod & copper rod have length of 80.1cm and 99.9cm respectively. At what temperature will the 2 rods have the same length.
Coefficients of linear expansion (per °C) copper rod.000017 steel rod.000012
2.....The length of a brass bar increase from 4.001m into 4.0030 m. find the final temperature of the bar if the initial temperature was 0 Celsius.
Coefficients of linear expansion (per °C) brass .000019

I will be happy to critique your work. These are straightforward uses of simple equations.

Your question #1 still contains a typo error