calculate water pressure

Question

At the surface of the ocean, the water pressure is the same as the air pressure above the water, 15 lb/in2. Below the surface, the water pressure increases by 4.34 lb/in2 for every 10 ft of descent.
(a) Express the water pressure in lb/in2 as a function of the depth d in feet below the ocean surface.

Answer 1

P(d) = 15 + 4.34(d/10)

 

P(d) = 15 + 0.434d

 

d in feet, P(d) in lbs/in²