The neurosurgeon asks you to implement hyperventilation in a…

The neurosurgeon asks you to implement hyperventilation in a patient with a CHI. The patient is currently on the following settings: PRVC  VT 500 mL   f 14 BPM   Ti 1 sec   PEEP 5 cmH2O   FiO2 of 0.5 ABG is as follows:  pH 7.30   PaCO2 45 mmHg   PaO2 100 mmHg   HCO3- 29 mEq/L Which of the following frequency changes is most likely to accomplish temporary hyperventilation in this patient?