No, connecting the positive output wire of a 4-channel car stereo head unit to another positive wire, and the negative output wire to another negative wire, will not produce more power to a speaker. This configuration could potentially short-circuit the amplifier or damage the head unit. Instead, to increase power to a speaker, you should consider using a dedicated amplifier designed for that purpose or ensure proper wiring and impedance matching for your speakers.
no
Negative times negative is always a positive.
Yes.
no.
multiplying and dividing a negative number will "flip" the sign of the other number. So multiplying two negative numbers will produce a positive number. Multiplying one positive and one negative number will produce a negative. And of course two positive numbers yield a positive.
Yes.
Yes
No. They could have an A- child, but not A+.
it is unlikly, but posible
It takes two rh negative parents to produce an rh negative baby.
yes
the baby may be A or O.