Please help (all the shown answers are wrong)

A(aq)+B(aq)C(aq) has a standard free-energy change of 4.75kJ/mol at 25C. What are the concentrations of A,B, and C at equilibrium if, at the beginning of the reaction, their concentrations are 0.30M, 0.40M, and 0M, respectively? How would your answers change if the reaction had a standard free-energy change of +4.75kJ/mol ? All concentrations would be higher. There would be more A and B but less C. All concentrations would be lower. There would be no change to the answers. There would be less A and B but more C