88\. A nurse is caring for a client who has chronic renal failure. The client displays the following ABG results: pH: 7.24 paCO2: 44 mm Hg, paO2: 84 mmHg, HCO3: 18 mEq/ L base excess - 2 and O2 saturation 95% The nurse should include that the client has which of the following acid-base balances?