please help thank you

3. [10 marks] A water column is open to the atmosphere on a day when atmospheric pressure is 30 inches Hg. (a) [3 marks] What is the gauge pressure (in inches H2O ) 4 inches below the surface? (b) [3 marks ] What is the absolute pressure (in inches H2O ) at the same depth? (c) [2 marks] Express the answer to part (b) in inches Hg. (d) [1 mark] Express the answer to part (b) in kPa. (e) [1 mark] Express the answer to part (b) in bar