What is the relationship between galvanic cells and equilibrium?

How does the Nernst equation help in calculating cell potential under non-standard conditions?

Given a standard cell potential of 0.76 V and n = 2, calculate the equilibrium constant K.

Calculate ΔG at 298 K for a reaction with an equilibrium constant K = 100.

Calculate ΔG for a reaction with n = 3, F = 96485 C/mol, and E°_cell = 1.5 V.