I attached the problem of interest (probably the only part you guys need to see is the equations at the bottom). My answers are off by a magnitude of 10 compared to the solutions. (copy and pasted it below since the pic is a little hard to see at the bottom) q = σε f*A(T^4 − Ts^4 ) = 5.67 Χ 10^−8 Χ ε Χ 1 Χ (π Χ 0.1^2 )(T^4 − 77^4 ) = 1.7813 Χ 10 −8 ε (T^4 − 77^4 ) When they did 5.67*10^-8 * 1 * pi * (.1)^2, they got 1.7813*10^-8. I plugged that into my calculator, but I got 1.7813*10^-9. Normally, I would think this was a typo, but in the next part (not included in image), they plotted values that were a magnitude of 10 different from mine. This has me thinking that I might have missed something. What do you guys think?