In certain deep parts of oceans, the pressure of seawater,
P, in pounds per square foot, at a depth of d
feet below the surface is given by the following equation P=12+4/9d
. Use this equation to complete the statements below. Round your answers to the nearest tenth as needed.
The pressure of seawater is 85 pounds per square foot at a depth offeet below the surface of the water.

The pressure of seawater is pounds per square foot at a depth of 85 feet below the surface of the water.

Step-by-step explanation:

The relationship between the pressure, p of sea water in certain deep parts of oceans is and the distance, d below the surface is given by the following equation P= p = 12 + 4/9d

Where

p is in pounds per square foot.

d is in feet

1) The pressure of seawater is 85 pounds per square foot at a depth

85 = 12 + 4/9d

4.9d/9 = 85 - 12 = 73

Cross multiplying, it becomes

4.9d = 73 × 9 = 657

d = 657/4.9

d = 134.1 feet

2) At a depth of 85 feet below the surface of the water, the pressure of seawater is

p = 12 + 4/9 × 85 = 12 + 4/765

p = 12 pounds per square foot.

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step-by-step explanation: