If a system is maintained at a pressure of 2 psi of vacuum, what is the pressure in psia (lbs per square inch absolute)

The absolute pressure of the system is 12.7 psia.

Explanation:

Let suppose that system works at an atmospheric pressure of 14.7 psia, the absolute pressure is equal to the atmospheric pressure minus vaccum pressure, that is:

Where:

- Absolute pressure, measured in pounds per square inch.

- Atmospheric pressure, measured in pounds per square inch.

- Vacuum pressure, measured in pounds per square inch.

Given that and , the absolute pressure of the system is:

The absolute pressure of the system is 12.7 psia.

i think the answer is a, hope this : )

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form