exam Maths Puzzle Numerical Ability

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

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PLEASE HELP ME:
The amount of a radioactive tracer remaining after t days is given by A=Ao e^-0.18t where Ao is the starting amount at the beginning of the time period. How much should be acquired now to have 40 grams remaining after 3 days? 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