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10 points for Q and Z in Scrabble.
The answer is Q.
Two ratios, p/q and r/s (q and s non-zero) are equal if p/q - r/s = 0.
Yes.
Yes. If one matrix is p*q and another is r*s then they can be multiplied if and only if q = r and, in that case, the result is a p*s matrix.