3p
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(p+3)5 or p(3x5) depending on what way you say it.
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.
14p
pa
just do 163 divided by 14 simple as that. :P :P :P :P :P