These?
http://www.jiskha.com/display.cgi?id=1432067727
http://www.jiskha.com/display.cgi?id=1432068338
I posted a response to your last two queries and now I can't find your original question nor my answers.
Did you get everything taken care of on that H2S problem? My final answer was x = 0.00167 but also talked about how to solve the cubic equation using a web calculator as well as how to do it by iterations.
2 answers
Yes, those are the ones. I may be able t find them with the time.