At the surface of the ocean, the water pressure is the same…

At the surface of the ocean, the water pressure is the same as the air pressure above the water, 11 lb/in.2 Below the surface, the water pressure increases by 4.12 lb/in.2 for every 10 feet of descent. ​Find an equation for the relationship between pressure (P) and depth (d) below the ocean surface where pressure is in lb/in.2 and depth is in feet.