Pressure equations and explinations?

Question

Can someone explain these and the answers?

What is the pressure in atmospheres of a gas that has a pressure of 720 mm Hg?

What is the pressure in Pascal of a gas that has a pressure of 1.33 atm?

A sample of gas is attached to a manometer. The mercury in the tube attached to the sample is 50 mm LOWER than the mercury open to the atmosphere. What is the pressure in atmospheres of the sample?

If the atmospheric pressure is 99,100 Pa, what is the pressure in mm Hg?

Answer 1

1.00 atm = 760 mm Hg = 760 torr = 101.325 kPa

720 mm Hg / 760 mm Hg per atm = 0.947 atm

1.33 Pa x 101.325 kPa/atm x 1000 Pa/kPa = 134,762 atm

(99,100 Pa / 101325 Pa/atm) x 760 mm Hg/atm = 578 mm Hg