Final answer:
The best next step after Gary gives 30 chest compressions is for Tomas to give 2 breaths during CPR.
Step-by-step explanation:
After Gary gives 30 chest compressions during CPR, the best next step is for Tomas to give 2 breaths. This is because CPR is a combination of chest compressions and rescue breaths designed to provide oxygen and circulation to a person who is experiencing cardiac arrest. The chest compressions help to pump blood to the body's vital organs, while the breaths deliver oxygen to the lungs and remove waste gases.
Learn more about CPR procedure