Please help explain how to do it with an answer please all of the three question please

If the association constant, Ka, for a certain protein-ligand pair is 50,000 , what is the dissociation constant, Kd ? Please provide your answer in decimal form, not scientific notation. Calculate for a certain protein-ligand pair when the ligand concentration = 1M and the Kd=11015 M. If the association conctant, Ka, for a certain protein-ligand pair is 50,000 , what is the dissociation constant, Kd ? Please provide your answer in decimal form, not scientific notation