Algebra 2 Homework

Question

In certain deep parts of oceans, the pressure of sea water, P,P, in pounds per square foot, at a depth of dd feet below the surface, is given by the following equation:

P=13+4d/9

If a scientific team uses special equipment to measures the pressure under water and finds it to be 221 pounds per square foot, at what depth is the team making their measurements?

Answer: The team is are measuring at   feet below the surface.

Answer 1

You have the necessary formula for the pressure and the variable d is the depth.

221 = 13 + 4d/9

Subtract 13: 208 = 4d/9

Mult by 9: 1872 = 4d

Divide by 4: d = 468 ft.