(adsbygoogle = window.adsbygoogle || []).push({}); equation help -- water pressure at bottom of a pond

I'm trying to solve this problem "A car is flipped upside down in a pond, .50m below the surface, how much force is needed for the driver to push open the door." I got this wrong because the formula that was chose was F = (P - (P+rho x g x y)) So my question is when do include rho x g x y when solving problems?

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# Homework Help: Equation help - water pressure at bottom of a pond

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