At a 33-foot depth underwater, the pressure is 29.55 pounds per square inch (psi). At a depth of 66 feet, the pressure reaches 44.4 psi. At what rate is the pressure increasing?

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So the depth increases by 66-33 = 33 feet, and the psi increases by 44.2-29.55 = 14.65 psi. so psi is increasing by 14.65 psi/33feet = 0.443939394 psi/foot