Here I'm going to show all that I've understood -
1.
2.
3.
What I've attempted -
L = Lo (1+ α * ẟT)
ẟT = 150°C - 15°C = 135°C
(Steel) L = ẟL (1 + 11 * 10^-6 * 135)
(Copper) L = ẟL (1 + 17 * 10^-6 * 135)
This doesn't get me anywhere, obviously.
Am I supposed to understand from the...