How much potassium chloride 20% should you dilute to prepare 480 mL of potassium chloride 2.5%?

As an EMS provider, when you approach an emergency situation, when does the scene size-up begin?

A) As you arrive at the scene B) Once you make your initial contact with the patient C) After you have received a briefing from witnesses D) On the way to the scene

The role of a first assistant includes

a. maintaining visibility of the surgical site. b. maintaining membership in the local hospital. c. organization of the back table and Mayo stand. d. starting the procedure before the surgeon gets there.