Where Pabs is absolute pressurePg, is gauge pressure, and Patm is atmospheric pressure. For example,
if your tire gauge reads 34 lb/incz (pounds per square inch), then the absolute pressure is

48.7 psi

Explanation:

To get absolute pressure, it's given by getting the sum of atmospheric pressure and gauge pressure. Now for this case, when the tire gauge reading is 34 lb/incz (pounds per square inch) and then adding the atmospheric pressure of 14.7 lb/incz (pounds per square inch) then the absolute pressure will be 34+14.7=48.7 lb/incz (pounds per square inch) which is equivalent to equivalent to 336 kPa

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west

you can cut your hand off if your not