help mee please i have to find x, y, z and complete reaction

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1. Cu + 4HNO₃ → Cu(NO₃)₂ + 2NO₂↑ + 2H₂O     X = HNO₃2. 4NO₂ + O₂ + 4NaOH → 4NaNO₃ + 2H₂O         Y = O₂, NaOH3. 2NaNO₃ →t°→ 2NaNO₂ + O₂                            Z = O₂, NaNO₂Good luck in Chemistry!)