A graph of EAgCl,Ag against ln c has data for which the equation of the line of best fit is: y = 0.0257x + 0.2303. What is EoAgCl,Ag in Volts?

I have no idea of what you are talking about... maybe if you post the question, at least a part of what you are asked to do, the procedures in the experiment... we'll get a better idea?

For instance, what is c?