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## Homework Statement

I am wrong in my attempt, yet I can't figure out the reason why...

View attachment 230978

## Homework Equations

View attachment 230979

(solution with h=250 W/m^2*K instead of 350 W/m^2*K)

## The Attempt at a Solution

View attachment 231065

This is how I obtain the answers, which I checked all the calculations and I don't think there is numerical problem. I followed the steps in the solution manual, yet I am wrong and I don't know why.

Can anyone see anything going wrong here?

thank you so much!

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