A patient had a white blood cell count of 6,000 per mm3. Express this value in scientific notation.

What is the maximum FiO2 expected to be delivered by most air-entrainment masks?

a. 30% b. 40% c. 50% d. 60%

Which of the following case histories best correlates with the presence of Leptospira interrogans in the urine?

A) A homeless female with poor personal hygiene. B) A boy scout who played with field mice he caught while on a camping trip. C) A park ranger who presents with an erythema migrans on her leg. D) A hiker bitten by a tick on his last trip to the mountains.