Look on the plug. Usually the negative side will have a small minus sign on it. The positive side is the one with the plus on it.
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when you square a negative number you also get a positive result (because a negative times a negative gives a positive)
Yes
Nothing five is a prime factor and so nothing whether positive or negative will multiply to negative five, this question is impossible. The two part doesn't matter because the five part makes the whole statement false.
Yes. eg: a fraction -4/2 = -2 an integer
LED's are DC voltage. Transformers are AC voltage. There is no positive or negative on AC voltage. You would need a diode to change the AC to DC, then there would be positive and negative voltages.