Can you please explain how to do both of these?

How many grams of NaHCO3 (formula weight 84.00g/mole ) should be mixed with 5.00 grams of NaOH (formula weight 40.01g/mole ) to produce a buffer with pH 10.20 ? A. 22.7 B. 6.45 C. 6.15 D. 4.52 E. 9.80 F. 16.2 G. 15.0 H. 24.7 How many grams of solid NaOH(FW40.00g/mol) must be added to 50.0mL of a 0.100F fully protonated arginine solution to make a buffer of pH 4.00 ? Put answer to correct number of sig figs here: g