1. The problem statement, all variables and given/known data so i just had some questions: 1. is there a difference between h and d? sometimes i see P = [tex]\rho[/tex]gh and other times P = [tex]\rho[/tex]gd is there a difference? because if d=depth while h=height, would d always be a neg number? 2. for hydrostatic pressure, i was taught: P = Patm + [tex]\rho[/tex]gd, but i notice when I look at other's questions they will leave out the atmospheric pressure. Is there a difference? why do they leave it out? 3. Is there some kind of "steps" i can follow when assessing a pressure/fluid problem to decide what method to use to solve it? for example, if it is a U-tube problem, look to use the concept that at the same level pressure is equal in the two arms so P1 = P2.... thanks in advance for all your help!!