**1. The problem statement, all variables and given/known data**

I’m struggling to understand question 1.C

How do I incorporate T_{w} and later eliminate this?

**2. Relevant equations**

-k*A*(ΔT/ΔX)

**3. The attempt at a solution**

For 1.a I used this equation: -k*A*((T_{inside}-T_{outside})/thickness wall) I thought to put T inside first as they ask for the inward heat flow and that will be negative (heat loss)….

For 1.c I’m really stuck…

http://ift.tt/1lcpyHF