exam Maths Puzzle Numerical Ability

I need help on a few problems. The first one I tried is (radical sign)x-6 +8=x
I started by subtracting 8, so I got (radical)x-6 =x-8, then I think you square each, and now I am

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I need help solving the following problem:

For a resistor in a direct current circuit that does not vary its resistance, the power the resistor must dissapate is directly propor
Pressure varies inversly as volume. When the pressure is 16 pascals, the volume is 84 liters. What would the volume be if the pressure is reduced to 12 pascals?